Photo of a dam with fish passage structure and lamprey passage structure

Fish Passage Guidance Resource for Pacific Lamprey and Bull Trout

The goal of this project is to develop a design guidance resource intended to provide the background, rational, and recommendations needed to design proper fish passage facilities for Pacific Lamprey, Bull Trout and other USFWS trust species in the Pacific Northwest. The guidance resource is to be completed Summer of 2021.

photo of arctic grayling at the bozeman fish technology center

Developing Small-Scale Fishways for Use in Headwater Streams; New Technology and Standards for Increasing Landscape Connectivity Benefits of Fishways to Support Bull Trout, Arctic Grayling, and Cutthroat Trout

This project will begin the research necessary to develop and implement Denils of varying size (e.g. smaller) and more appropriate to the stream. Dramatic alterations to the dimensions of a Denil may make the device appropriate for the delicate flow balance that exists in small streams while maintaining effective upstream fish passage.  Laboratory testing to begin in Summer 2020.

photo of haley tupen surveying at the huntley bypass channel

Efficacy of the Nature-like Bypass Channel at Huntley Diversion Dam, Yellowstone River, Montana

The purpose of this study is to evaluate the reconfigured Huntley fish bypass in 2019 and 2020 by estimating fish passage rates through the bypass and measuring and modeling the hydraulics of the bypass channel to determine its passability by various species under different river stages.  Field work began on this project in Summer 2019.

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Improving Conservation Status of Arctic Grayling; Assessing and Increasing Landscape Connectivity Benefits of Denil Fishways in the Big Hole River Watershed

The purpose of this study is to evaluate the use and effectiveness of Denil structures installed in existing irrigation diversions throughout the Big Hole watershed.  The study will identify features of present installations that prevent, limit and allow successful passage of Arctic grayling and other fish species.  Field work was completed on this project in Summer 2017 and 2018.  (Photo: ¬©Matt Blank, 2015)

 
Denil Fishway with Flow Restrictor

Modifying Denil Fishways to Optimize Arctic Grayling Passage

The purpose of this project is to evaluate four different flow management structures to determine which are the most effective at passing Arctic grayling through Denils.  A flow management structure is a weir-like device that is installed on the upstream end of the Denil fishway to control the amount of flow passing through it.  Laboratory testing at the Bozeman Fish Technology Center was completed in Summer 2017. 

 
Denil Fishway at Bozeman Fish Techonolgy Center

Evaluating the Efficacy of Denil Fishways in Irrigation Structures for Passage of Arctic Grayling

The purpose of this project is to evaluate how water depth affects passage success for Arctic grayling through both a 6-foot and a 12-foot Denil.  These two lengths are the standard sizes used for passage at irrigation diversions.  Laboratory testing at the Bozeman Fish Technology Center was completed in Summer 2016.  Results were presented at the American Fisheries Society Western Division Meeting in May 2017.

 
Actic Grayling swimming in flume

Volitional Swimming Performance of Arctic Grayling in an Open-Channel Flume: A Baseline Study

We are characterizing the swimming performance of Arctic grayling, a species of special concern, for fish passage assessment and design.  This project will also be used as a baseline for additional studies on Arctic grayling.  Laboratory testing at the Bozeman Fish Technology Center was completed in Summer 2015.