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Report: Arrow Lakes Reservoir Nutrient Restoration Program COL-F22-F-3496-DCA
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Arrow Lakes Reservoir has been influenced by the construction of 3 dams - Hugh Keenleyside (1968), Mica (1973) and Revelstoke (1984). Hugh Keenleyside raised maximum water levels inundating the former Upper and Lower Arrow Lakes to form Arrow Lakes Reservoir. The increased water levels impacted high quality spawning and rearing habitat in tributaries.
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Author: Marley Bassett, Steve Arndt and Tyler Weir
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Old Reference Number: COL-F22-F-3496-DCA
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Old Reference System: FWCP - Fish Wildlife Compensation Program Columbia
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Date Published: Mar 2022
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Report ID: 60020
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Audience: Government and Public
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Revelstoke Dam blocked access to spawning and rearing habitat in tributaries upstream of the reservoir, and both Mica and Revelstoke Dams caused long-term changes in light penetration and nutrients in the lentic habitat of Arrow Lakes Reservoir. As a result of decreased upstream nutrient inputs, Kokanee stocks in Arrow Lakes declined substantially by the mid-1990s. To address the nutrient losses in Arrow Lakes Reservoir, a bottom-up approach was taken with the addition of nutrients (nitrogen and phosphorus in the form of liquid fertilizer) to increase phytoplankton populations that are suitable to produce Daphnia, the main food source for Kokanee. Nutrients have been added to Upper Arrow since 1999 and are dispensed from Waterbridge ferries, roughly April to September. Columbia Power Corporation contributes 25% of the costs to this project to compensate for fish entrainment through the Arrow Lakes Generating Station as per DFO Authorization No. 5300-10-002. Nutrient addition has been a successful technique used for the enhancement and conservation of sockeye salmon populations as well as being successful in restoring Kokanee populations in lakes and reservoirs altered by hydroelectric construction.
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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 - Bull Trout - Salvelinus confluentus |
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Fish Species - Kokanee - Oncorhynchus nerka |
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Fish Species - Rainbow Trout - Oncorhynchus mykiss |
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Invertebrates - Aquatic |
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Region - Kootenay |
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Fish and Fish Habitat - Lake |
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Fish and Fish Habitat - Monitoring |
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Fish and Fish Habitat - Restoration |
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Watershed Groups - 300 - Columbia |
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Water Information - Limnology |
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Water Information - Restoration |
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Program Specific Area - Kootenay Compensation Program |
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