Project Updates

Preliminary Design Report for Hayden Lake Restoration Project Now Available The Hayden Lake Watershed Improvement District (HLWID) has released the Preliminary Design Report (PDR) for the Hayden Lake and Hayden Creek Restoration Project, along with supporting documents and public feedback materials. This report marks an important early step in addressing water quality in Hayden Lake, particularly in the North Arm, where harmful algal blooms (HABs) have occurred in recent years.   What the Preliminary Design Report Includes The Hayden Lake Preliminary Design Report outlines potential strategies to improve lake health by: Reducing phosphorus pollution in Hayden Lake from Hayden Creek Addressing phosphorus stored in lake sediments and aquatic vegetation Improving water circulation in the North Arm of Hayden Lake These concepts are part of an early-stage (10%) design process and will continue to be refined through additional data collection, engineering, and environmental review. View Full Report   Community and Agency Feedback Following the release of the report, HLWID gathered input from residents, partner agencies, and technical experts. Key topics included: Project timeline and construction expectations Questions about Hayden Lake water levels and environmental impacts Clarification of nutrient sources contributing to algal blooms Feedback on proposed restoration approaches A full summary of comments and responses is included in the documents below. View Comments   What’s Next for the Hayden Lake Restoration Project The project will move into the next phase of design and evaluation, which includes: Refining restoration alternatives Additional water quality monitoring and analysis Environmental permitting and funding coordination Continued public outreach and engagement   More Information from Public Meetings Public Meeting on Drinking Water Grant – 12/17/2025 EutroPHIX North Bay Hayden Lake In-Lake Restoration – 12/17/2025 SWCA Hayden Creek – 12/17/205   Stay Informed on Hayden Lake Water Quality HLWID will continue to share updates as the Hayden Lake restoration project progresses. Ongoing community involvement is an important part of protecting and improving long-term water quality in Hayden Lake. Get Updates!

Project Update for January 2026: In January, the SWCA and EutroPHIX engineering team completed the preliminary design report based on their initial field and engineering work addressing cyanobacteria in the North Arm of Hayden Lake. This report represents the key deliverable from the Phase I grant work to date and will be submitted to the DEQ for review and comment. You can view the report here: Preliminary Design Report. If you have questions or comments, please contact us at: contact@haydenlakewid.com. Thank you,HLWID