Heron Lake

Smith-Root constructed a concrete weir to include a barrier for exclusion of invasive species, particularly carp.
  • Location: Heron Lake, Minnesota
  • Commissioned: 1991
  • Type: Lake

Project description

Smith-Root designed and constructed this weir and upstream barrier for the Minnesota Department of Natural Resources as part of the Heron Lake restoration project. The deck and the sloping sides were poured in place using an Insulcrete™ mix.

Seven steel flat bar electrodes are located 36 inches apart in slots in the concrete. The barrier is energized by six pulsators.

The side walls were later fitted with combs to prevent fish from skating over the shallow edge water.

Services provided

  • Coordination with Minnesota DNR
  • Structural design of weir
  • Electrical and electronic design of the pulsators and power supply systems
  • Construction of weir and electrodes
  • Supply of electronics
  • Regular maintenance

Site characteristics

  • Pulsators: 6.0kVA GFFB
  • Pulsator Qty: 6
  • Power Output: 36kW max.
  • Water Depth: 0-6 feet
  • Waterway Width: 80 feet
  • Water Velocity: 0-6 ft./s
  • Conductivity: 1380 µs/cm max.