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Report: Alouette Watershed Community Connections Project FWCP COA-F25-F-4086
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The completion of the Alouette Dam in 1928 effectively blocked salmon access to what was then called Lillooet Lakes, now referred to as the Alouette Reservoir. All five resident salmon species experienced dramatic declines in numbers due to the loss of habitat in the upper portion of the watershed as well as downstream impacts such as the loss of the rivers natural capacity to overflow seasonal channels.
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Author: Greta Borick-Cunningham
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Old Reference Number: COA-F25-F-4086
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Old Reference System: FWCP - Fish Wildlife Compensation Program Coastal
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Date Published: Aug 2025
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Report ID: 63280
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Audience: Government and Public
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This project was needed as there is limited rearing habitat for salmonids in the Alouette River. Trethewey Channel, originally completed in 2007, required built up fine sediments to be removed from the streambed and invasive reed canary grass to be cleared from the inlet and outlet of the channel in order to reopen valuable off-river salmonid habitat.
Trethewey Channel had filled in with sediment and invasive reed canary grass in recent years, significantly restricting the flow and reducing rearing habitat. By clearing out the channel and enhancing the surrounding riparian area, the amount of usable salmonid rearing spaces within Trethewey Channel was increased, providing 1288 square meters of off-channel habitat for salmonids to thrive in. Priority areas that were worked in were identified in conjunction with Fisheries and Oceans engineers and biologists, who also oversaw the instream works prior to works commencing.
It is anticipated that chinook, chum, coho, pink, and sockeye salmon will all benefit from this completed project work although some species such as coho salmon are more likely to benefit from this habitat in the winter season as well as additional freshwater fish species that reside within the Alouette Watershed.
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Report Type
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Fish and Aquatic Habitat Information |
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Subject
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Fish Species - Chinook Salmon - Oncorhynchus tshawytscha |
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Fish Species - Chum Salmon - Oncorhynchus keta |
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Fish Species - Coho Salmon - Oncorhynchus kisutch |
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Fish Species - Pink Salmon - Oncorhynchus gorbuscha |
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Fish Species - Sockeye Salmon - Oncorhynchus nerka |
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Region - Lower Mainland |
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Fish and Fish Habitat - Enhancement Assessment |
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Fish and Fish Habitat - Restoration |
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