Experiences With Fish Screens in Western Montana

MONTANA UPDATE Mark Lere, Habitat Bureau Montana Fish, Wildlife and Parks WHAT WE DONT HAVE SCREEN LAWS SCREEN SHOPS SPECIFIC FUNDING (Mitchell Act) ANADROMOUS FISH NMFS OVERSIGHT

WHAT WE DO HAVE SOME NEEDS! A FEW EXAMPLES. UPPER BIG HOLE RIVER Home to the last fluvial arctic grayling population in the contiguous United States Has very robust Candidate

Conservation Agreement with Assurances Program One main goal of the CCAA is to eliminate entrainment into irrigation systems Supports traditional agriculture most rely on flood irrigation for hay crops, thus numerous diversions

Photo by Mark Conlin YELLOWSTONE RIVER Series of 6 low head diversion dams Hinder or block upstream fish passage for numerous warm water species of fish, including pallid sturgeon , paddlefish, sauger, blue sucker.

The diversions entrain lots of fish Miles City T & Y Diversion (Rm 20.4) Map of the Yellowstone River, tributaries, and diversion dams with approximate rive INTAKE DIVERSION 1,300 cfs diversion Passage barrier to

most fish species Entrainment estimates for Intake diversion range from 50,000 to 350,000 fish per month Recently screened, but passage remains a BIG issue BULL TROUT & CUTTHROAT TROUT Losing native trout

species to entrainment Losses commonly not well quantified Diversions typically have not been prioritized Most screen and passage projects are opportunity based Federal strings occasionally drive projects

NON-NATIVE SPORT FISH Also have concerns about entrainment of our nonnative sport fish Typically rainbow trout and brown trout WHAT WE ARE DOING - SCREENS Installed a variety of screens Infiltration galleries Simple passive horizontal screens

Passive inclined plane screens Turbulent fountains FCA screens Rotary drum screens Vertical flat plate screens Traveling belt screens Efforts not centralized Not all meet NMFS criteria FISH SCREENS

Scale of Screen Projects From small to very large A majority of our installed screens are around 20 cfs or less. WHAT WE ARE DOING FISH PASSAGE Many passage projects completed across the state From projects for our stronger

swimming and jumping fish in the west To our weak swimming, nonjumping fish in the east WHAT WE ARE DOING - BARRIERS At times, it appears that we have a split personality disorder Migration barriers are

being used to isolate our native cutthroat trout from non-natives (rainbow trout, brook trout, and brown trout)

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