DEQ seeks comment on draft 401 water quality certification for​ Blacktail bank stabilization project

Accepting comments from August 27, 2025, through September 17, 2025.

The Idaho Department of Environmental Quality (DEQ) is seeking comment on a draft water quality certification for the Blacktail bank stabilization project.

The objective of the proposed project is to stabilize a severely eroded unstable section of shoreline along Ririe Reservoir using riprap. Approximately 833.33 cubic yards of riprap, in varying sizes, will be placed along a 250-foot-long section of shoreline, extending 25 feet in width and up to 10 feet in height.

Based upon review of the federal ​permit​ application, readily available water quality related materials, and certification request in accordance with 40 C.F.R. §§ 121.5 (b) and (c) and 121.7 (c), DEQ, certifies that if the permittee complies with the terms and conditions imposed by the federal ​permit​ and the conditions set forth in this water quality certification, then it is reasonable for DEQ to conclude that the activity will comply with water quality requirements, including applicable requirements of the Clean Water Act §§ 301, 302, 303, 306, and 307, Idaho’s “Water Quality Standards” (IDAPA 58.01.02), and other appropriate water quality requirements of state law.  

The draft certification is available for review on DEQ’s website and at DEQ’s State Office. Written comments will be accepted through September 17, 2025, at 5 p.m. Mountain Time. Submit comments electronically using the form below or by mail or email to:  

Destiny Locke
900 N. Skyline Drive, Suite B
Idaho Falls, ID 83402
destiny.locke@deq.idaho.gov

Related Documents

Draft Certification

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/.