East Fork of Rock Creek Dam Rehabilitation

The East Fork of Rock Creek Dam Rehabilitation project involves rehabilitating dam features to extend the dam's safe, reliable performance. The work includes demolishing the existing concrete spillway, constructing a concrete labyrinth spillway, constructing a seepage control berm, extending the existing outlet conduit, refurbishing the outlet conduit and valves, constructing a new gatehouse with a pedestrian bridge, installing new instrumentation, and building a new concrete bridge over the spillway approach channel. The contract was awarded to multiple vendors, including Big Sky Civil Constructors, McMillen, Inc., Missouri River Contractors, Inc. and Montana Civil LLC, NW Construction, Inc., and Prospect Construction, Inc., dba Prospect Construction Group, Inc. The base bids ranged from $19,757,177.00 to $24,288,409.00. • The project requires the demolition of the existing concrete spillway and the construction of a new concrete labyrinth spillway. • The project includes the construction of a seepage control berm and the extension of the existing outlet conduit. • The project requires the refurbishment of the outlet conduit and valves, as well as the construction of a new gatehouse with a pedestrian bridge. • The project involves the installation of new instrumentation and the construction of a new concrete bridge over the spillway approach channel.