Lake Skinner Outlet Tower Shutdown (Notification of Lake or Streambed Alteration, EPIMS Notification No. EPIMS-RIV-23077-R6)


SCH Number
Public Agency
California Department of Fish and Wildlife, Inland Deserts Region 6 (CDFW)
Document Title
Lake Skinner Outlet Tower Shutdown (Notification of Lake or Streambed Alteration, EPIMS Notification No. EPIMS-RIV-23077-R6)
Document Type
NOE - Notice of Exemption
Document Description
The Project includes changes to stream areas associated with a dewatering event and shutdown of the Lake Skinner Outlet Tower. Dewatering to allow staff to conduct maintenance. This event may occur between March 2022 through May 2023 or modified dates with CDFW approval. Project activities in the stream areas include the placement of erosion control measures and the release of water into jurisdictional areas from one discharge location within Tucalota Creek. Dewatering methods include releasing water via an existing outlet pipe; diverting raw water through a filtration system, dissipation socks, or dewatering hoses; and discharging the water to stream areas. Between the defined dates, approximately 3.1 - 24.8-acre feet (AF) of raw water will be released into the Lake Skinner concrete spillway, located near the southern end of the Lake Skinner Dam, and temporarily held in a grouted riprap basin at the base of the spillway. The water will be released from the basin to Tucalota Creek through an existing drain valve at a rate of 75-100 gallons per minute, equal to about 0.20 cubic feet per second (cfs), for approximately seven days. The release will be regulated at the release valve to maximize percolation into Tucalota Creek. While one dewatering discharge is planned for this location, Metropolitan may be required to dewater the Lake Skinner Outlet Tower up to eight additional times at up to 5 cfs in order to make the necessary repairs, if deemed necessary following the post-repair inspection for a total of 3.1 to 24.8 AF of water discharged into Tucalota Creek.

Contact Information

Breanna Machuca
Agency Name
Fish and Wildlife, Region 6
Job Title
Environmental Scientist
Contact Types
Lead/Public Agency


Southern California

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Class 1; California Code of Regulations, title 14, section (15301)
Reasons for Exemption
This project is limited to the repair and maintenance of an existing structure and will result in minor alterations to the land.
County Clerk


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