Colorado River Aqueduct Lakeview Siphon Shutdown (Notification of Lake or Streambed Alteration, EPIMS Notification No. EPIMS-RIV-24497-R6).


SCH Number
Public Agency
California Department of Fish and Wildlife, Inland Deserts Region 6 (CDFW)
Document Title
Colorado River Aqueduct Lakeview Siphon Shutdown (Notification of Lake or Streambed Alteration, EPIMS Notification No. EPIMS-RIV-24497-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 Colorado River Aqueduct Lakeview Siphon. Dewatering to allow staff to conduct maintenance. This event will begin February 4, 2022, continuing through February 7, 2022, 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 San Jacinto River. 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 28-acre feet (AF) of water will be released into the San Jacinto River through three temporarily installed hoses adjacent to the river. The water will be released from the pipeline to the San Jacinto River through the temporarily installed hoses at a rate of 3000-gallons per minute, equal to about 6.7 cubic feet per second (cfs), for pproximately 72 hours.

Contact Information

John Dempsey
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
Type – Class 1; California Code of Regulations, title 14, section (15301) Type - Class 4; California Code of Regulations
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 which do not involve removal of healthy, mature, scenic trees.
County Clerk


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