PNP designed, built, and installed an 800’ X 42’ temperature curtain at Whiskeytown Lake, located approximately 10 miles west of Redding California in the Whiskeytown National Recreational Area, Shasta County, California. The temperature curtain is a cost-effective method to contain the warmer water and algae near the water surface while allowing the deeper, cooler water to flow downstream to aid migrating fish.  As a result, the Bureau of Reclamation was able to meet federal requirements to improve fish passage and continue its mission to protect the environment.

This custom-designed fabric curtain was constructed of 5-ply 60 mil CSPE Hypalon, a chlorosulfonated polyethylene (CSPE) synthetic rubber (CSM) noted for its resistance to chemicals, temperature extremes, and ultraviolet light.  It is supported by a steel boom and incorporates an integral 30” diameter steel frame boat passage gate.  The flexible barrier to fit the location and delivered it in two sections, requiring minimal on-site assembly.  

 Key Features

  • 30” X 20’ foam-filled steel floats
  • 48” foam-filled steel anchor buoys
  • 5-ply 60 mil CSPE Hypalon Fabric Curtain
  • 30” diameter steel frame boat passage gate
  • Weights, chain and all rigging components
  • Shore anchors with clump weights on nearshore curtain sections
  • Deployed for year-round use
  • The anticipated lifespan of 8-10 years