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Home My WebLink About2013-10-01-City-Council-PresentationsmallCity Council Work Session October 1, 2013 Tonight’s Objectives: •Work Session •Answer Questions asked at the September 17th Work Session and correspondence •Review Staff Recommendations •Answer Additional Questions from Council •Formal Meeting •Outline Staff Recommendations •Provide Opportunity for Public Input •No formal action will be taken tonight Roadway elevations Flooding issues Construction Design considerations / footprint reduction Is it correct that Dubuque Street has been closed 150 days in the last 20 years due to flooding? Would Dubuque street have been closed only 6 days if the road/bridge were at a 100 + 1 elevation? •Both statements are correct •Does not include closures from local heavy rains Have you assessed any other intermediate flood levels? •Looked at 200+1 elevation •Approximately 3.4 feet higher than 100+1 elevation •Updated comparisons for backwater, cost and cross sections in council packet Why is the use of Hesco barriers in combination with a lower roadway elevation not a reasonable option? Risk to keep Dubuque Street open with temporary measures Impacts to traffic during deployment / removal Pedestrian / bicycle traffic not possible Estimated cost of approx. $690,000 to deploy per event 85% reimbursable for federally declared disaster deployment How will water runoff from the east side of Dubuque Street be handled? Runoff conveyed from east to west to river Will still use open ditches and cross-culverts Project will reconstruct and upsize both for better conveyance Will not be a certified levee when complete Can more information be provided on future road closures by various impact levels? Can only look to past events What is the economic impact when Dubuque Street closes? Staff working with Economic Development Division, Summer of Arts and the Chamber of Commerce to try to develop impact of 2008 and 2013 How will the project relate to the Corps operation plan for the Coralville Reservoir? Maximum release of 20,000 cfs could be achieved without impact to elevated Dubuque Street How would cost overruns during construction be paid for? Current estimate includes 20% contingency Cost overruns paid for by G.O. Bond proceeds Wastewater project is over 70% complete with 1% change orders Cost clarification between Gateway and No Build options? Cost estimates presented for Gateway options were for construction only and did not include Final Design, Construction Admin and Inspection Fees Trunk sewer not included No Build cost estimate did include the Final Design, Construction Admin and Inspection Fees Travel lanes in the Preferred Alternative are 12’ wide. Can this width be reduced and if so, what will the affects be? This is the standard for Iowa DOT Design Manual, Statewide Urban Design and Specifications, and AASHTO Green Book Accommodates all vehicles that currently use the corridor Reducing lane width could lead to an increase in crashes To increase safety on Dubuque St and Park Rd, would it be better to reduce speed from 35 mph to 25 mph? Would a reduction in lane width result in a reduction in speed? Currently an Arterial street at 35mph Speed management will be studied during design Lane width reduction could lead to reduced speed, but lane width reduction could also lead to increase in crashes I-80/Dubuque is now signal controlled as is Foster/Dubuque Could a pedestrian-activated signal be installed at Mayflower? Will be considered during final design Could have positive impact on ped safety and speed control Other locations with pedestrians crossing in corridor Would have a negative impact of traffic delay The Preferred Alternative recommends wide sidewalks on both sides of Dubuque Street. Can these widths be minimized or perhaps eliminated on the east side? Purpose and Need to maintain and enhance amenities Brown to Foster walk was frequent request at public meetings Reducing widths or eliminating east sidewalk counter to goals Would reduce walkability of corridor Iowa River Trail most heavily used in the metro area North of Kimball, roadway shifted west to reduce impact Can parkway widths be reduced? Would create winter maintenance issues Would reduce safety buffer Can the median width be reduced from 0 – 25’ to 0 – 12’? South of Kimball – No median proposed Kimball to Ridge – alignment shifted west Same as current medians to maintain character of corridor Provides storage for Cambus and turning vehicles It has been indicated that a right turn lane from southbound Dubuque to westbound Park is warranted by the MPOJC. Why is a new turn lane necessary? Right turn lane warranted threshold is apx. 300 vehicles/hour Current traffic is 715 SB right turns on to Park Rd in morning Right turn lane will increase function and safety Lane would not impact the wooded bluff Are dual left turn lanes required on eastbound Park Road? Can we have a shared right and left-turn lane to reduce the width of the new bridge? Dual left needed to obtain acceptable service levels Will help anticipated growth in Hancher traffic turning NB Will analyze more closely during final design Is the 3rd lane on Park Road really needed? Recommended by MPOJC in 2008 Part of approved CIP Helps Park Road and Hancher traffic operate at acceptable service levels Are there additional options available for shrinking the horizontal footprint and minimizing impact along the Bella Vista hillside at Dubuque and Park Road? Retaining walls along east side of sidewalk Steeper slopes Tree wells for protecting mature trees Tree replacement Native plantings along affected hillside and slope What are the design criteria affecting clear zone and the use of barriers? Look to Iowa DOT Design Standards for clear zone and barrier requirements Setback of retaining wall in the Preferred Alternative greater than required clear zone The top of wall does not require a crash worthy barrier if it is outside the required clear zone Clear zone will be verified and analyzed in more detail during design •Level of Protection for Dubuque Street •Backwater Reduction Goals •Structural Type of the Bridge Recommended minimum level of protection for Dubuque Street: One foot above the 2008 flood. * Including one day for cleaning, inspection and repair Protection Option # of Days Closed from Past Flood Events Inches Above/Below the 2008+1’ Protection Level Existing 150 NA 100 year +1’ 7* - 39” 200 year +1’ 5* - 11” 2008 flood +1’ (Recommended) 0 0” 500 year +1’ (EA Preferred) 0 + 19” •Rocky Shore Drive / Highway 6 Flood Gate •Riverside Drive Lift Station •South Gilbert / Stevens Drive Flood Gate •Floodplain Map Update 2008 2013 After 2008 we are now implementing a $6.6M upgrade that is part of a 5 project $26.9M collaborative regional effort to protect this area. 2008 After 2008 the University installed a temporary flood wall to protect the Art Building. Also, a $1M joint project to upgrade to the lift station is planned. 2008 After 2008 upgrades to the existing level of protection were investigated, but the estimated cost exceeded funding that was available. After 2008 the Floodplain Management Ordinance was amended to require protection to 1’ above the 500 year event. 2008 Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Bridge Type Low Steel Elevation Backwater Reduction at Idyllwild Incremental Improvement in Backwater Reduction Deck Elevation Incremental Height of Bridge Deck Constructi on Cost Estimate with Dubuque at 100yr + 1’ Constructi on Cost Estimate with Dubuque at 200yr + 1’ Construction Cost Estimate with Dubuque at 2008 + 1’ Construction Cost Estimate with Dubuque at 500yr + 1’ Deck Girder 100yr + 1’ 3.4” 660.20 $32.67 M $34.26 M Deck Girder 200yr + 1’ 6.1” 2.7” 662.52 27.8” $34.63 M $35.01 M Deck Girder 2008 + 1’ 6.6” 0.5” 663.45 11.2” $33.41 $35.17 M Deck Girder 500yr + 1’ 7.0” 0.4” 665.03 19.0” $34.20 M $35.01 M $35.34 M $36.65 M EA Preferred Alternative Deck Arch 100yr + 1’ 3.6” 659.20 $36.01 M $37.59 M Deck Arch 200yr + 1’ 4.7” 1.1” 661.52 27.8” $37.96 M $38.34 M Deck Arch 2008 + 1’ 5.2” 0.5” 662.45 11.1” $36.71 M $38.48 M Deck Arch 500yr + 1’ 5.6” 0.4” 664.03 19.0” $36.94 M $38.33 M $38.66 M $39.98 M Through Arch 100yr + 1’ 3.4” 656.87 $35.99 M $37.58 M Through Arch 200yr + 1’ 4.9” 1.5” 659.02 25.8” $37.93 M $38.31 M Through Arch 2008 + 1’ 5.2” 0.3” 659.95 11.1” $36.70 M $38.47 M Through Arch 500yr + 1’ 5.8” 0.6” 661.53 19.0” $36.90 M $38.30 M $38.63 M $39.60 M Receive FHWA approval / Finding of No Significant Impact Decide on the design parameters: •Dubuque Street Elevation •Backwater reduction goal •Bridge Type Begin Final Design