CH#207 - Rainbow Dam



Rainbow Dam



Generating capacity: 36 megawatts*

Photo Courtesy City of Great Falls



The Challenge:

Rainbow Dam, operated by PPL Montana, was constructed in 1910, and is 1,055 feet long and 29 feet high. It is an eight-unit hydroelectric plant on the Missouri River about six miles northeast of Great Falls, Montana. One megawatt of power can satisfy the average energy needs of 750 households and maintenance of the facility and mechanisms is a priority.
The spill gates had some rust and needed a durable coatings system to protect the structural steel from further corrosion. The coatings had to have the ability to withstand Montana’s extreme weather and expand and contract during the winter freeze/thaw cycles.


Benefits Desired:

  •     Quick Dry Time
  •     Minimum Downtime
  •     Minimum Surface Preparation
  •     Address Rust and Corrosion
  •     Non-Toxic, Low V.O.C.’s
  •     Ability to withstand extreme weather conditions
  •     Cost Effective
  •     Long-Lasting Solution




Minimal wet scraping was needed to expose the rust and corrosion before R.I.P.™ Rust Inhibiting Primer was applied sealing in and stopping further corrosion of the surface.Your Last Coatwas then applied completing this 20 year warranted system. Your Last Coat was custom tinted to meet the client’s needs.