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Report: Kootenay Lake (North) & Arrow Lakes Reservoir Nutrient Restoration Program (NRP) Review COL-F22-W-4119-DCA
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BC Hydro has installed several dams in the upper Columbia River basin that have created storage and
hydroelectric generating capacity (Fig.1). These dams significantly altered the hydrological regime of three large natural lakes, Kootenay and Upper and Lower Arrow Lakes, starting in 1967 with the Keenleyside and Duncan dams, Mica Dam (1973) and Revelstoke Dam (1984).
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Author: Robert E. Hecky and Stephanie J. Guildford
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Old Reference Number: COL-F22-W-4119-DCA
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Old Reference System: FWCP - Fish Wildlife Compensation Program Columbia
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Date Published: Nov 2022
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Report ID: 61671
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Audience: Government and Public
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In the USA, the Libby Dam (1975) brought about the regulation of the Kootenay River over 200 km upstream of Kootenay Reservoir. As a result of these alterations, there were unintended consequences to the ecosystems of
these natural lakes including declines in the fishery production in the lakes to record low levels in Kootenay Lake and Arrow Lakes Reservoir by the 1990s. This led to programs of nutrient restoration in these reservoirs by actively adding fertilizer to ensure productive and diverse aquatic communities and to restore and maintain fishery production (Ashley et al., 1997; Korman et al., 1990; Pieters et al., 2003). To adaptively manage the restoration programs and assess efficacy of accomplishing Nutrient
Restoration Program (NRP) objectives, an ecosystem monitoring program was established; and the reservoirs have been continuously treated with fertilizer, phosphorus (P) and nitrogen (N), on both Kootenay Lake since 1992 and the Arrow Lakes Reservoir since 1999 (Fig. 2). The P addition was the target of the program to replace P retained in upstream reservoirs while N was added in appropriate ratios to maintain balanced algal growth. The current Columbia Region: Reservoirs & Large Lakes
Action Plan (FWCP, 2019), recognizing that the NRP programs have been in place for over two decades, calls for a technical review and assessment of the efficacy of the NRP programs in meeting program objectives and providing the necessary monitoring to enable adaptive management of the programs. A directed project in the FWCP (2019) Reservoirs and Large Lakes Action Plan is to undertake a detailed review of the overall effectiveness of the Kootenay Lake (North) and Arrow Lakes Reservoir Nutrient Restoration Programs (NRPs). This technical review is contributory to that program review.
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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 - Kokanee - Oncorhynchus nerka |
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Region - Kootenay |
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Fish and Fish Habitat - Restoration |
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