FLOOD03503 - Laserfiche WebLink

Home Browse Search

Right-of-Way Acquisition -0- I I I I I I I I I I I I I I I I I I I COMMENTARY - SHEET 2 OF 12 COST ESTIMATE - SHEET 2 OF 12 The proposed improvement to the State Highway #93 crossing of Cressmans Gulch will eliminate the overflow hazard that currently exists up to and including the 100-year flood event. Future plans to widen and re-route the highway should utilize the hydrology and preliminary design data presented on this sheet in engineering the final design. Until this crossing has been improved, the area between North Ford Street and State Hi ghway #93 will remai n subject to flooding. Floodplain regulations should be strictly enforced until the hazard has been effectively el~minated. ITEM COST Channel Improvements Street Crossings Utility Relocation $ 13 ,000 45,000 -0- Subtota 1 Contingencies (15%) Engineering, Legal & Administrative (15%) 58,000 8,700 8.700 The channel ization shown from State Highway #93 to the old channel of Cressmans Gulch is a conceptual alignment proposed by the developer. Alter- native alignments may be considered as development plans proceed. Key points to keep in mind are that: 1) the existing condition forces 100-year flows to split downstream of State Highway #93, 2) the floodplain east of the abandoned railroad grade should be eliminated, 3) the existing homes east of North Ford St reet must be protected from fl oodi ng, and 4) any channel i zat i on work pro- posed will be the responsibility of the developer. A possible channel configuration is shown on the plan drawing, with provisions for maintenance access whi ch coul d serve also as an extens i on of a planned trail s system. Drop structures will be required to maintain an acceptable stream gradient. The cost estimate which follows does not include the developers cost for channelization. TOTAL CONSTRUCTION COST 75,400 TOTAL CAPITOL COST OF IMPROVEMENTS 75,400 TOTALS IN EACH JURISDICTION City of Golden Jefferson County 16,900 58,500 Grade stabilization structures are recommended to maintain the existing channel and reduce degradation problems which may occur. The channel improvement cost estimate relates to the 3 structures shown and not the planned improvements upstream. The general recommendat i on for grade stabilization is consistent with downstream reaches. Annual Operation and Maintenance Costs (2,000) The recommendation for this reach includes the enforcement of floodplain regulations and continued participation in the National Flood Insurance Program. Pri vate property owners who are currently impacted by the 100-year floodplain should be encouraged to acquire flood insurance.