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Juvenile Salmonid Assemblages at the Mirror Lake Complex in the Lower Columbia River before and after a Culvert Modification

Journal Article · · North American Journal of Fisheries Management
DOI:https://doi.org/10.1002/nafm.10249· OSTI ID:2506902
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Abstract

This study examined salmonid assemblages upstream of a culvert connecting the Mirror Lake Complex with the lower Columbia River before and after the culvert was modified to improve habitat connectivity and fish passage. Initially the culvert limited water flow between the Columbia River and the Mirror Lake Complex. The outlet and interior of the culvert were reconfigured to create a more “natural” and suitable passageway for salmonids through the removal of riprap and the strategic placement of boulders, cobbles, gravels, baffles, and weirs. Prior to the culvert modification, three sites were sampled monthly between April and August of 2008, 5.0 and 0.5 km upstream of the culvert and immediately downstream of the culvert. After the culvert modification, the same sites were sampled from 2009 to 2012, with two additional sites added in 2010. Sites near the culvert supported Chinook Salmon Oncorhynchus tshawytscha, Coho Salmon O. kisutch, and Chum Salmon O. keta, while sites further from the culvert supported unmarked Coho Salmon and Rainbow Trout O. mykiss, steelhead (anadromous Rainbow Trout), and Cutthroat Trout O. clarkii. Clear trends in salmonid occurrence were not observed, although densities of Chinook Salmon tended to be higher in years postmodification than before modification. Culvert modifications should focus on alleviating site-specific fish passage conditions to result in substantial changes to habitat connectivity.

Sponsoring Organization:
USDOE
OSTI ID:
2506902
Journal Information:
North American Journal of Fisheries Management, Journal Name: North American Journal of Fisheries Management Journal Issue: 1 Vol. 39; ISSN 0275-5947
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

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