The Upper Main Ditch transports water from the Forebay Reservoir to the Reservoir 1 Water Treatment Plant. The ditch is approximately three miles in length. The project will replace this open conveyance with a 42-inch welded steel or concrete cylinder pipe. The project alignment will install pipe within private easements in portions of the ditch and cross country sections, and Public Right of Way in portions of Blair Road. The pipeline will have the capacity to deliver 40 cubic feet per second, the maximum flow available from Forebay Reservoir.

• Reduce water loss resulting from seepage and evapotranspiration thereby contributing to EID’s overall water conservation efforts and supply reliability
• Protect drinking water quality by eliminating the potential for intentional or unintentional contamination of the open ditch
• Reduce operations and maintenance costs that would result from increased treatment and pumping costs
• Eliminates a potential safety issue of the open conveyance

Upper Main Ditch Piping Project - Overall Alignment Map (PDF)