Culmback Dam Access Improvements

Project Summary

The project consisted of fabricating and installing a new galvanized steel stairway along the downstream face of Culmback Dam at Spada Lake, located about 20 miles North of Sultan, Washington.  Work included approximately 283 feet of stairway with 13 intermediate landings installed on new cast-in-place pedestals, installation of an access ladder platform, access gates, new ladders to safely access the base of the Culmback Dam toe wall, and other miscellaneous work. This project was a requirement of the Jackson Project relicensing.

Snohomish County PUD No. 1 is a high-profile client in the national construction industry, known for advancements in the renewable energy sector.  IMCO is excited to work with their team.



Snohomish County, WA (near Sultan, WA)


Snohomish County PUD No. 1

Contract Amount





May 2014 - August 2014

Project Highlights

Crews performed work at the project site located on Culmback Dam which creates Spada Lake. Spada Lake is a managed reservoir associated with the Henry M. Jackson Hydroelectric Project north of Sultan, situated in Snohomish County, Washington.