Official Government Website

St. Joe River Basin Nutrient Source Inventory 

Project Sponsor 

Coeur d’Alene Tribe 


The purpose of this project is to evaluate phosphorus loading from streams and rivers that discharge into the southern end of Coeur d’Alene Lake. This information will help set priorities for future nutrient reduction efforts. 

The Coeur d’Alene Tribe is leading this study, which is based on a recommendation from the 2022 National Academies of Sciences report recommendation. The study will be conducted over two years and include 35 monitoring locations in the St. Joe and St. Maries River Basins, and Benewah, Lake, and Plummer Creeks. Together, these water bodies contribute an estimated 80 tons of phosphorus into the lake each year, accounting for almost 40% of the total phosphorus load. 


This project was awarded $1.2 million from Governor Little’s Leading Idaho initiative. 


The Coeur d’Alene Tribe hired a hydrologist for this project and is looking to hire two additional hydrologic technicians.  


Upon completion of the study, the Coeur d’Alene Tribe will develop a nutrient management action plan for these watersheds. A final report on nutrient loading is expected in late 2025.

Image of the St. Joe River.
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