Palisades Creek

Smith-Root designed and constructed a permanent barrier to divert upstream-migrating fish into a bypass fish trap.
  • Location: Irwin, Idaho
  • Commissioned: 2009
  • Type: Waterway

Project description

Idaho Fish and Game operates a continuing program to protect native cutthroat trout from non-native rainbow habitat and possible crossbreeding pressures. One part of this effort involves intercepting all upstream-migrating fish in particular streams so that the rainbow can be removed. A pilot installation of a temporary Smith-Root fabric barrier at a diversion weir on Palisades Creek, a tributary of the Snake River, proved successful in 2007. Smith-Root designed and constructed a permanent barrier at the same site. This involved removing the existing weir deck and rebuilding the deck and sidewall liners with Insulcrete™ containing slots for five steel U-shaped flat bar electrodes.

A big issue with this stream is the high bedload carried during spring run-off. This has led to several modifications to the electrodes to mitigate damage.

Services provided

  • Coordination with Idaho Fish and Game
  • Civil and structural design of barriers
  • Electrical and electronic design of the pulsators and power supply systems
  • Construction of the barrier
  • Regular maintenance
  • Electrode modifications for improved resistance to bedload

Site characteristics

  • Pulsators: 1.5kVA POW
  • Pulsator Qty: 3
  • Power Output: 4.5 kW max.
  • Water Depth: 6 feet
  • Waterway Width: 43 feet
  • Water Velocity: 8 ft./s
  • Conductivity: 200 µs/cm max.