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Coeur d’Alene Stormwater Volume Reduction Project

Project Sponsor 

City of Coeur d’Alene 


The purpose of this project is to install stormwater storage and filter systems at Independence Point, Sanders Beach, and along Mullan Avenue in Coeur d’Alene, Idaho. These management strategies will help divert stormwater runoff from existing discharge points, also known as outfalls, in the urban drainage areas and serve as opportunities to share water quality information with the community. 

Stormwater runoff pollutants from yards, sidewalks, and streets eventually flow into storm drains that discharge directly to Coeur d’Alene Lake in these neighborhoods. Two Sanders Beach outfalls collect runoff from 76 acres, and the East Mullan outfall drains 13 acres of area. The Independence Point outfall conveys runoff from 131 acres to the lake. Without stormwater management installations, pet and wildlife waste, vehicle fluid, any fertilizer not taken up by lawns and gardens, and anything that may spill onto sidewalks, gutters, alleys, and streets in these areas flows into Coeur d’Alene Lake untreated. This project redirects runoff through a variety of filtration systems and, barring high precipitation or snowmelt events, prevents this surface runoff from reaching the lake. 

Even with these management measures in place, it is important for residents and visitors to be mindful about daily habits such as fertilizer use and waste disposal. Less pollution to capture and filter means less maintenance time and cost. Additionally, even filtration systems can be overwhelmed, increasing possibility that phosphorus and other pollutants in stormwater can reach Coeur d’Alene Lake. 


This project was awarded $1.4 million from Governor Little’s Leading Idaho initiative.


The Sanders Beach and Mullan Avenue outfalls are complete. Work on Independence Point starts in spring 2024.  


This project is expected to reduce phosphorus loads to Coeur d’Alene Lake by approximately 280 pounds annually. The estimated phosphorus load reductions for each drainage area are as follows:  

  • Sanders Beach: 140 pounds of phosphorus/year 
  • Mullan Avenue: 20 pounds of phosphorus/year  
  • Independence Point: 120 pounds of phosphorus/year 
ver: 3.5.2 | last updated:
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