DEQ seeks comment on draft 401 water quality certification for Waltman Lane bridge replacement

Accepting comments from May 22, 2025, through June 12, 2025.

the Idaho Department of Environmental Quality (DEQ) is seeking comment on a draft water quality certification for the Waltman Lane bridge replacement project.

This project proposes replacing the existing bridge spanning Waltman Lane with a new bridge extending 55 feet across Tenmile Creek. The design includes a 23-foot-wide culvert, overtopping asphalt, pedestrian sidewalks, and protective riprap installation both upstream and downstream of the culvert.

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.  

Written comments will be accepted through June 12, 2025, at 5 p.m. Mountain Time. Submit comments electronically using the form below or by mail or email to: 

Meghan Cline
1445 N Orchard St.
Boise, ID 83706
meghan.cline@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/.