Specifications include, but are not limited to: • As much as is reasonable, the bridge design shall eliminate any hydraulic deficiencies currently present in the river 300 feet up and downstream of the proposed bridge. The proposed bridge shall not have any negative effect on the river channel, shall not increase the base flood elevation by more than 0.00 feet, and the lowest member of the bridge shall have a minimum of 3-feet of clearance above the 1% chance base flood elevation. • Perform a survey as required for design which includes topographic elevations, and all existing features including, utilities, roadway and concrete features, lane striping, driveways, signs, meter boxes, pedestals, vegetation, etc. The survey limits shall extend 400 feet up and down the river, along each leg of the intersection, to Center Street on Riverside Drive, 400 feet west on Center Street, and 400 feet east on Mountain Road from the Center Street Riverside Drive intersection. • Provide a geotechnical/soils report that includes at a minimum, a roadway structural section, bridge abutment foundation design, and riverbed design as may be applicable. • Generate a preliminary 15% design (horizontal alignment) illustrating the City’s standard residential collector cross-section on 100 N and Riverside Drive, and a collector cross-section for Center Street. • Full roadway design of 100 North from Jens Johansen Park (839 E 100 N) to Thrushwood Drive. Full roadway design of impacted area along Riverside Drive.
