The City is requesting assistance completing an alternatives analysis by developing four planning level alternatives, including an existing conditions alternative for a baseline comparison, to select a path forward for the East Main Deer Creek Culvert Replacement Project. The selected alternative will be based on a weighted matrix developed by the consultant and should consider; environmental impacts, traffic impacts, permitting requirements, property acquisition, private property impacts, cost, fish passage, benefit to existing and future habitat, water quality, operations and maintenance, utility relocations (private and public), upstream and downstream impacts, and hydraulic capacity. Preliminary sizing of a fish passage culvert for this location indicates that the culvert needs to be approximately 30 feet wide. Two preliminary options have been identified that will be incorporated into this analysis. The first option is the construction of the 30-foot-wide culvert from the current pipe inlet location to the culvert outlet, roughly 300 feet. The second option is the construction of the culvert under E Main Ave, and then extending the creek channel on the upstream end of the culvert from the existing culvert inlet to the road edge. Both of these options will require the City to either purchase the land impacted by the culvert extension or create easements for accessing this land. The study should include an evaluation of the level of effort to gain access to the needed land and existing property rights based on existing recorded utility easements.
