DEQ seeks comment on draft 401 water quality certification for ​I-84 Meridian Road Interchange to Eagle Road Interchange

Accepting comments from September 25, 2025, through October 16, 2025.

BOISE – The Idaho Department of Environmental Quality (DEQ) is seeking comment on a draft water quality certification for the I-84 Meridian Road Interchange to Eagle Road Interchange project.

The proposed project will improve safety and traffic operations on eastbound I-84. Work includes adding an auxiliary lane and shoulder, building a two-lane on-ramp at Meridian Road, and a two-lane off-ramp at Eagle Road. The project will impact an unnamed irrigation ditch and two wetlands within the project boundary.

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. Written comments will be accepted through October 16, 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, Idaho 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/.