Fish Ladder Weir Modifications to Minimize Escapement

Krebs, Eric and Gravenhof, Dylan A. and Caasi, Joshua M. A. and Hanten, Robert P. and Huysman, Nathan and Voorhees, Jill M. and Barnes, Michael E. (2021) Fish Ladder Weir Modifications to Minimize Escapement. Engineering, 13 (04). pp. 173-183. ISSN 1947-3931

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Abstract

A fish ladder, weir, and raceway at Whitlock Spawning Station are used to capture and retain feral fall Chinook salmon (Oncorhynchus tshawytscha) for spawning from Lake Oahe, South Dakota. Nearly 40% of the salmon ascending the fish ladder have been documented to escape from the holding raceway by descending the ladder. This manuscript describes modifications to the weir that eliminated nearly all escapements, except for an inconsequential number of small non-spawning fish. The modified design using the existing structure incorporated free-swinging, spaced steel bars with a back-stop to create a one-way gate. The modified gate does not require springs, hydraulics, or electrical power. It is relatively simple to construct and requires minimal maintenance.

Item Type: Article
Subjects: Open Research Librarians > Engineering
Depositing User: Unnamed user with email support@open.researchlibrarians.com
Date Deposited: 14 Jun 2023 12:04
Last Modified: 04 Nov 2023 06:28
URI: http://stm.e4journal.com/id/eprint/1213

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