Sixmile Creek

2.5 CFS Modular Screen

Quick Facts:

  • Location: Frenchtown, MT
  • Basin: Clark Fork
  • Partners: TU, USFS, USFWS, and River Design Group
  • Installation Date: October 2011

This Farmers Screen project addresses the following issues:

Sixmile Creek modular fish screen

Trout Unlimited, the US Forest Service, US Fish and Wildlife Service, River Design Group, and FCA teamed up to provide in-stream passage and install a fish screen on this previously unscreened diversion located NW of Missoula, MT in the LoLo National Forest.  Sixmile Creek is a tributary to the Clark Fork.

A two section modular Farmers Screen system was used to screen the 2.5 CFS of irrigation water.  This screen will protect Westslope Cutthroat and brook trout.

The new screen system consists of:

  • New headgate
  • New pipe from headgate to the screen system
  • 2 section modular Farmers Screen system
  • Piped fish return utilizing a new fish return flume design

Sixmile Creek is a high gradient stream with seasonally high levels of organic debris.  The point of diversion is located in the LoLo National Forest.  A primary reason the project partners chose a Farmers Screen was due to the low level of maintenance required.

Prior to the fish screen installation, Forest Service Biologists from the Ninemile Ranger District and students from Frenchtown High School salvaged and relocated 544 fish from the irrigation ditch.  Since 2007, more than 2,300 fish have been salvaged from this ditch.  Installation of this fish screen and passage structure will prevent the entrainment of fish and allow for unimpeded passage up and down Sixmile Creek.