Category: Uncategorized
Coeur d’Alene Lake Comprehensive Coring Project
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Project Sponsor
Coeur d’Alene Tribe
Purpose
This project is a collaboration between the Coeur d’Alene Tribe, Idaho Department of Environmental Quality, University of Oregon, and Indiana State University. This team is analyzing lakebed sediment core samples from Coeur d’Alene Lake and determining how the history of metals contamination and recovery actions along the Coeur d’Alene River have impacted the lake. The analyses focus on geochemistry and ecological parameters through time and seeks to answer the following questions:
- What was the lake’s baseline ecology and environmental condition before mining impacts and other human activities?
- How has the lake’s ecology and environmental condition changed through the mining era and the subsequent remedial, restoration, and lake management work?
- If recent history continues, how do we expect the lake’s ecology and environmental conditions to respond, given the paleolimnologic context generated by this study?
Funding
This project received $200,000 from Governor Little’s Leading Idaho initiative, with matching funds provided by Avista Corp ($200,000) and the Coeur d’Alene Basin Restoration Partnership.
Current Status
Core samples were collected in September 2024. The analyses have started and will continue over the next two to three years. The final report is expected in 2027.
Outcome
This project will provide information to guide future restoration efforts. More realistic lake restoration goals can be set when viewed through a richer historical lens than what is provide by the current lake monitoring record.
Third Street Stormwater Volume Reduction Project
Project Sponsor
City of Coeur d’Alene
Purpose
The city of Coeur d’Alene is installing a stormwater storage and filtration system to divert stormwater runoff from an existing outfall.
The Third Street outfall discharges stormwater from 240 acres of city streets and parking areas, including downtown alleys. The outfall currently releases this stormwater, untreated, by the Third Street boat launch next to McEuen Park. While all stormwater carries pollutants as it passes over residential yards, city parks, sidewalks, and streets, this area includes special considerations related to dumpsters, grease, food waste, cigarette butts, and other substances that tend to concentrate in downtown streets and alleys. In addition, large rainfall events have overwhelmed the capacity of this storm system in recent years, causing localized flooding.
Improved stormwater treatments will manage this runoff and reduce pollutant loading to Coeur d’Alene Lake.
Funding
This project received $413,143 from Governor Little’s Leading Idaho initiative.
Current Status
Project design is complete and out for bid.
Outcome
Currently, the funding available is not sufficient to treat stormwater from the entire drainage area, but this project is expected to reduce phosphorus loads to Coeur d’Alene Lake by at least 35 pounds annually. As more funding is secured, the city will expand the treatment capacity.
DEQ prepares IPDES preliminary draft permit for the city of Post Falls
May 24, 2023
The Idaho Department of Environmental Quality (DEQ) released an Idaho Pollutant Discharge Elimination System (IPDES) preliminary draft permit to the city of Post Falls for preliminary review on May 18, 2023.
The facility has ten days to review the preliminary draft permit and fact sheet for any errors and omissions that should be addressed before the public participation period. After the preliminary draft period has concluded, DEQ will revise the preliminary draft permit as needed, at which point it will soon become a draft permit for public review and comment.
DEQ will formally notify all necessary parties that the draft permit, fact sheet, and associated application have been posted on DEQ’s website for public review and comment, per the “Rules Regulating the Idaho Pollutant Discharge Elimination System Program” (IDAPA 58.01.25.109). To be notified of the forthcoming posting, go to the DEQ’s “Newsroom” page and click the “Subscribe” link.
Northside Stormwater Drainage Improvements (Marmot Trail Road)
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Project Sponsor
East Side Highway District
Purpose
The purpose of this project is to improve drainage systems along Marmot Trail Road, which includes approximately 3,600 feet of asphalt along a steep gradient. Managing erosion will reduce discharge into the north end of Coeur d’Alene Lake.
Funding
This project was awarded $14,100 from Governor Little’s Leading Idaho initiative.
Status
This project is complete.
Outcome
This project is expected to decrease phosphorus loading and sediment discharge from soil erosion that flows from stormwater into Coeur d’Alene Lake near the Silver Beach Marina.
Mica Creek Watershed Agricultural Sediment Reduction and Improvement Project (Phase 2)
Project Sponsor
Kootenai Shoshone Soil and Water Conservation District
Purpose
This project stabilized 1,600 feet of streambank on Mica Creek, a tributary to Coeur d’Alene Lake, by removing collapsed vegetation, armoring the banks, and replanting willows to prevent further erosion. These upgrades will reduce sediment and phosphorus loads to Coeur d’Alene Lake.
Funding
This project received $49,000 from Governor Little’s Leading Idaho initiative.
Current Status
The project was completed in summer 2024.
Outcome
This project is estimated to reduce phosphorus loads to Coeur d’Alene Lake by 50 pounds annually.
DEQ seeks comment on Tier II operating permit for LA Semiconductor LLC
Accepting comments from October 10, 2025, through November 10, 2025.
The Idaho Department of Environmental Quality seeks comment on a draft Tier II operating permit for LA Semiconductor LLC.
LA Semiconductor LLC operates an integrated circuit manufacturing facility in Pocatello, Idaho, primarily producing silicon wafers. Production steps include deposition, coating, cleaning/stripping, etching, and doping, which directly and indirectly generate air emissions. DEQ issued a Tier II operating permit for LA Semiconductor LLC in 2022, and the company is now seeking to renew the permit, which includes a facility emissions cap.
DEQ has determined that operation according to the proposed permit will not cause or significantly contribute to a violation of any ambient air quality standard and will not injure or unreasonably affect human or animal life or vegetation. DEQ has reviewed the application and completed an analysis of the information submitted by the applicant to renew Tier II facility emissions cap permit. Based on this analysis, DEQ proposes to issue the modified Tier II operating permit.
The draft permit materials are available for public review at DEQ’s State Office (1410 N. Hilton Street, Boise, Idaho) and on DEQ’s website. Written comments on the draft permit and supporting materials will be accepted through November 10, 2025, at 5 p.m. MST. Submit comments using the form below or via mail or email to:
Dianne Hobbs
1410 N. Hilton St.
Boise, ID 83706
dianne.hobbs@deq.idaho.gov
For technical assistance on questions concerning this project or the permitting process, contact Nachammai Vairavan at (208) 373-0502.
Related Documents
Permit materials
Accessibility Services: The Idaho Department of Environmental Quality will provide reasonable language access services and/or disability services for documents at no charge. To request an accommodation under Title VI of the Civil Rights Act of 1964 or Americans with Disabilities Act, contact DEQ’s nondiscrimination coordinator at (208) 373-0271 or accessibility@deq.idaho.gov. Para obtener información en español, visite https://www.deq.idaho.gov/about-us/accessibility/.