Red Wing Bridge Project - Minnesota Department of...
Transcript of Red Wing Bridge Project - Minnesota Department of...
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Red Wing Bridge Project
City Council MeetingAugust 26, 2013
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Overview of Past Progress• Determined the river crossing will be kept at current location
• Screened the range of concepts for the Minnesota and Wisconsin approach roadways
• Identified four river crossing options and seven bridge types
• Decided to proceed with two-lane option– Provisions being made to ensure the ability to expand to 4 lanes
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Rehab Bridge 9103
Replace Bridge 9103 In-Place
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Buttonhook
Buttonhook with Slip-ramp
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River Crossing – Rehab Alternative
• Option to add 6-foot cantilevered sidewalks on each side
• Retains a non-redundant, fracture critical structure
• Retains existing condition and visual setting
• Significant maintenance of traffic (MOT) considerations
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River Crossing – Replacement Alternatives• Assume new two-lane bridge immediately upstream from
existing river bridge
• Involve minimal MOT issues
• Some options are structurally redundant
• Greater structure depth (approach considerations)
• Provide a separated pedestrian and bicyclist trail
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River Crossing Decision:Proceed with Replacement Alternative
• Substantially less construction impacts, especially MOT & EMS;
• All bridge types can tie into rehab or replacement of Bridge 9103;
• Provides options that are structurally redundant;
• Provides a separated pedestrian and bicyclist trail;
• Allows treatment of water runoff prior to discharge into the river;
• Lower life-cycle costs than rehab alternative.
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Bridge 9040 Replacement TypesType 1 – Tied Arch
• Similar to new Hastings Bridge• Shallow bridge deck limits increases in the approach
roadway grades;• Can be designed to not be fracture critical;
RETA IN
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Bridge 9040 Replacement TypesType 2 – Simple Span Truss
• Grade raise would be minimal• Similar to existing bridge but only one span• Very difficult to make redundant• High maintenance and inspection costs
DISMISS
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Bridge 9040 Replacement TypesType 3 – Three-Span Continuous Truss
• Similar to existing bridge• Grade raise would be minimal• Fracture critical members would require unique
special designs• High maintenance and inspection costs
DISMISS
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Bridge 9040 Replacement TypesType 4 – Extradosed Bridge
• Grade raise would be about 10’• Similar to new St. Croix Bridge• High costs and construction complexity
DISMISS
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Bridge 9040 Replacement TypesType 5 – Cable-Stayed Bridge
• Grade raise would be minimal• Tall towers would have large visual impact• High costs and construction complexity
DISMISS
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Bridge 9040 Replacement TypesType 6 – Concrete Segmental Box Girders
• Grade raise would be the greatest• Lower construction cost• Structurally redundant, not fracture critical• Lowest future maintenance costs
RETA IN
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Bridge 9040 Replacement TypesType 7 – Steel Box Girders
• Grade raise would be about 10’• Structurally redundant, not fracture critical• One of the lowest cost options
RETA IN
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Bridge 9103 Rehabilitation Study• Bridge 9103 is eligible for the National Register of Historic Places• Followed new MnDOT-FHWA historic bridge process• Goal was to determine if there are feasible rehab alternatives that
meet historic standards• Two feasible alternatives were identified• Study Report has been reviewed by SHPO and FHWA • Next step includes evaluating the rehab alternatives along with the
replacement alternatives considering all purpose and need factors
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Bridge 9103 Rehab Alternative
• Remove & replace 10-15 foot center strip• Patch deck. Replace joints• Adds a railing on the inside of the sidewalk• Also options to lower TH 61 & add Cathodic Protection
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Next Steps• Determine recommended approach roadway alternative(s)
• Conduct detailed analysis on the remaining alternatives
• Conduct third public open house late 2013 to present the alternatives analysis results and project alternative selection
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Schedule• Alternatives development and evaluation
– Through Late 2013
• Preliminary design and environmental documentation– Through Late 2014
• Final design – 2014 to 2017
• Construction– Multi-year project beginning in Summer 2018 (proposed)
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