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Report: Arrow Lakes Reservoir Nutrient Restoration Program
Year 17 (2015) Report
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If you have any questions on the information presented, or require additional report data or attachments, please contact the Report Contact
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This report is a summary of results collected as part of the monitoring of the nutrient
restoration program. The 17th years results are presented in long term datasets. Raw
data for 2015 is on file at FLNRO in Nelson BC.
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Author: Bassett, M.; Schindler, E.U.; Fox, R.; Vidmanic, L.; Weir, T.; Sebastian, D.
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Old Reference Number: 156
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Old Reference System: RD
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Date Published: Jan 2018
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Report ID: 53235
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Audience: Government and Public
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Upper and Lower Arrow Lakes Reservoir (referred to as Upper Arrow and Lower Arrow
in the report) is a warm, monomictic lake with isothermal temperatures from late fall to
early spring and stratification during the summer months. In 2015, 34 MT of Phosphorus
and 185 MT of nitrogen were added to Arrow Lakes Reservoir off the Columbia Ferry.
Upper and Lower Arrow Lakes Reservoir (referred to as Upper Arrow and Lower Arrow
in the report) is a warm, monomictic lake with isothermal temperatures from late fall to
early spring and stratification during the summer months. In 2015, 34 MT of Phosphorus
and 185 MT of nitrogen were added to Arrow Lakes Reservoir off the Columbia Ferry.
In 2015, flows were highest since the onset of the program. Flows were remarkably high
from June through end of August.
In 2015, Secchi disc measurements in the main body of the reservoir were typical of
previous years results. The seasonal pattern showed decreasing spring-to-summer
transparency associated with increasing phytoplankton biomass and increasing turbidity
due to spring runoff, followed by increasing transparency in the late summer and fall
months.
Epilimnetic phosphorous results in 2015 were within the range of previous years. Total
phosphorus concentrations averaged 2.56 μg/L and total dissolved phosphorous
concentrations averaged 2.03 μg/L. These results are indicative of oligotrophic
conditions. Epilimnetic dissolved inorganic nitrogen results averaged 110 μg/L, above
the nitrogen limitation threshold and within range of previous years.
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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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Watershed Groups - 300 - Columbia |
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Water Information - Limnology |
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Water Information - Water Quality |
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