Official Government Website

DEQ seeks comment on draft 401 water quality certification for Shoshone Falls Reservoir bank stabilization project

Accepting comments from June 1, 2021, through June 22, 2021.

The Idaho Department of Environmental Quality (DEQ) seeks comment on a draft 401 water quality certification for Shoshone Falls Reservoir bank stabilization project.

There are two areas of eroded banks along Shoshone Falls Reservoir. 300 linear-feet of eroded banks at site one and 200 linear-feet of eroded banks at site two. Work at both sites will be the same. The area within the sites will be grubbed and the debris removed. Reshaping of the banks will be done by an excavator positioned along the shoreline. Native material will be used to form a constant slope for placement of filter rock and provide a key at the bottom to lock in both filter rock and riprap. After the reshaping of the banks, a six-inch layer of filter rock will cover the native fill layer from the key to the top of the bank. Top soil will be seeded with grasses. Coyote willow will be planted in the riprap.

Based upon its review of the joint application for permit, received on May 25, 2021, DEQ certifies that if the permittee complies with the terms and conditions imposed by the permit along with 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 Sections 301, 302, 303, 306, and 307 of the Clean Water Act, the Idaho Water Quality Standards (WQS) (IDAPA 58.01.02), and other appropriate water quality requirements of state law.

Written comments will be accepted through June 22, 2021, at 5 p.m. MDT. Submit comments electronically or by mail or email to:

Sean Woodhead
Surface Water Quality Manager
650 Addison Avenue West, Suite 110
Twin Falls, ID 83301

Related Documents
Draft Certification

Public Comment Form

  • Hidden
  • Hidden
  • Hidden
  • Hidden

ver: 3.4.0 | last updated:
Jump back to top of page button