Albeni Falls Dam Spillway Modifications

Project Summary

IMCO is working to modify the Albeni Falls Hydroelectric Dam for the Army Corps of Engineers. The majority of construction is at the spillway crest, which is underwater. IMCO will utilize a dewatering setup in between the upstream and downstream spillway slots to create a coffer cell. Air piping will be suspended under the spillway deck for the length of the dam to supply air to the diffusers.

This project involves removing ten spillway gates with cranes and replacing the seals on the gates with an anti-freeze bulb so they are operable in winter weather. IMCO crews will also install a spray system that sprays deicer on the gears so they do not lock up and are operable in winter. The contract also includes refurbishing the bubbler system including new diffusers, new piping, and electrical work.



Oldtown, ID


Army Corps of Engineers

Contract Amount



March 2017 - Present