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Welcome • BOISE RIVER PEDESTRIAN BRIDGE Tonight’s open house is an opportunity for you to: • Review the bicycle and pedestrian bridge design concepts • Provide feedback on the selected bridge design • Ask questions of project staff ---PAGE BREAK--- BOISE RIVER PEDESTRIAN BRIDGE Project History • A feasibility study was conducted in 2015 by COMPASS on behalf of the City of Eagle which evaluated multiple bridge options and sizes • Several alternatives were developed and analyzed for constructability to meet the purpose and need and to identify the most cost-effective and environmentally- sound design Purpose and Need of the Project • Construct a pedestrian and bicycle bridge over the north channel of the Boise River • Create an active transport link between the Boise River Greenbelt system, planned pathways, and a rapidly growing residential and commercial core area • Provide a safe and convenient river crossing facility for pedestrians and cyclists EFFECTIVE FLOODPLAIN PROPOSED BRIDGE LOCATION EXISTING PATHWAYS TYPICAL EFFECTIVE FLOODWAY ---PAGE BREAK--- BOISE RIVER PEDESTRIAN BRIDGE Alternative Bridge Concepts Considered in Previous Studies • 2016 recommendation, three-span concrete bridge attached to existing structure - Creates inspection and maintenance issues - Hinders future SH-55 expansion - Requires bridge pier to be constructed in the active river channel - Not evaluated further • Separate single-span steel truss alternative - Additional evaluation of this alternative was completed ---PAGE BREAK--- BOISE RIVER PEDESTRIAN BRIDGE Single-Span Bridge Alternative (continued from previous study) Pros: • Pier not required • Minimizes hydraulic and environmental impacts Cons: • Least cost-effective alternative • Creates large structure footprint and depth Cost: • $3.4 million ---PAGE BREAK--- BOISE RIVER PEDESTRIAN BRIDGE Two-Span Bridge Alternative Pros: • Less costly than single-span alternative • Reduced overall structure footprint and depth • Pier not required in active river channel • Best balance of project requirements, needs and cost-effectiveness Cons: • Requires pier to be constructed within floodway • Requires additional hydraulic mitigation Cost: • $2.5 million ---PAGE BREAK--- BOISE RIVER PEDESTRIAN BRIDGE Why was the Preferred Alternative chosen and what benefits will it provide? - Meets project goals - Bridge pier located outside of the main active river channel - Lowest cost of feasible structures What has changed since the previous concept studies? - Increased required distance from existing Idaho 55 bridge for ongoing maintenance - Increased bridge length required to span floodway - Increasing construction costs due to market conditions Preferred Design Alternative (Two-Span Bridge) ---PAGE BREAK--- BOISE RIVER PEDESTRIAN BRIDGE What are the most important considerations for a new Boise River pedestrian and bicycle crossing? AESTHETICS COST MINIMIZE ENVIRONMENTAL IMPACTS CONNECTIVITY MOBILITY CONSTRUCT AT THIS LOCATION SAFETY CONSTRUCT AS SOON AS POSSIBLE ---PAGE BREAK--- BOISE RIVER PEDESTRIAN BRIDGE FEDERAL VERSUS LOCAL FUNDING High None No local funds All local funds if that is what it takes NEED/COMMUNITY INTEREST How important is this project to the community?