32 Discovery Dr.
Bozeman, MT 59718



Clearwater River Dam Removal and Channel Reconstruction

Clearwater River Dam Removal and Channel Reconstruction

AESI collaborated with Mainstream Restoration and was the Engineer of Record on a Fish, Wildlife and Parks project to design the removal of a 50-foot wide timber spillway associated with an earthfill dam on the Clearwater River. The work consisted of several components. The primary focus involved replacing an aging log crib spillway with a 200-foot long, 60-foot wide rock-lined step-pool channel at a 5% grade that would allow upstream movement of bull trout. Over 5,500 tons of rock up to 6 feet in diameter were used to construct the channel. Additionally, an emergency spillway with a buried 200-foot long grade control was constructed and the existing embankment was further stabilized with material removed from the spillway. The design of this $0.8 million project, including preparation of a full set of plans and specifications, was undertaken on a 3-month fast track schedule. The project was bid in the late summer, and the majority of construction was completed during the fall and early winter.