Status: In Progress


The project occurs in the Coeur d’Alene Lake south of Harrison and in the Coeur d’Alene River upstream of where it enters the lake.


Coeur d’Alene Lake integrates the physical, chemical and biological processes from its watershed, all of the upstream waters and contributing lands. Among these influences, the Lake has received mine waste from upstream sources in the Silver Valley. Pollution from historic mine waste deposited more than 75 million tons of sediments contaminated with metals like cadmium, lead, and zinc in the lake. Although pollution sources are being reduced through upstream cleanup activities, significant amounts of metals and nutrients continue to enter the lake every year. The nutrients, metals, productivity, organisms, and interacting processes of Coeur d’Alene Lake have been monitored continuously since 2003. The water quality monitoring and modeling of Coeur d’Alene Lake is described by section 4.3 of the Coeur d’Alene Basin Restoration Plan.


The project will continue monitoring the nutrients, metals, productivity, organisms, and interacting processes of Coeur d’Alene Lake to: 1) ensure there are no gaps in the water quality monitoring data, 2) enhance the ability to refine a modeling tool to predict effects of upstream actions, and 3) manage data to better inform and guide restoration. The project will also help the Partnership measure and evaluate Coeur d’Alene Lake’s response to restoration.


The project will measure, model, and improve understanding of Coeur d’Alene Lake, and the lake’s response to events and land use changes. Project data will also inform restoration projects and cleanup that deal with contaminated sediments.


Coeur d’Alene Tribe
Water Resources Program
401 Anne Antelope Ave
Plummer, ID 83851
(208) 686-5302


Coeur d’Alene Tribe


Idaho Department of Environmental Quality
AVISTA Corporation

Water quality monitoring equipment (called a buoy profiler system) that collects measurements throughout the water column

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