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Report: Arrow Lakes Reservoir Nutrient Restoration Program Year 17 (2015) Report

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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.

Author:  Bassett, M.; Schindler, E.U.; Fox, R.; Vidmanic, L.; Weir, T.; Sebastian, D.

Date Published:  Jan 2018

Report ID:  53235

Audience:  Government and Public

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.

Report Type
  Fish and Aquatic Habitat Information
 
Subject
  Fish and Fish Habitat - Restoration
  Fish Species - Kokanee - Oncorhynchus nerka
  Region - Kootenay
  Watershed Groups - 300 - Columbia
  Water Information - Limnology
  Water Information - Water Quality
 


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