Bowman Low Level Outlet Phase 2 Repair Project (Project)


SCH Number
Public Agency
State Water Resources Control Board
Document Title
Bowman Low Level Outlet Phase 2 Repair Project (Project)
Document Type
NOE - Notice of Exemption
Document Description
On Jan. 26, 2013, a surge event in the low level outlet at the bowman North Dam caused a significant leak in the 1920s era outlet piping and valves. In 2013, NID performed the Phase 1 repairs on the low level outlet, which included removing and replacing the off stream portions of the piping and valves. Phase 2 repairs include the installation of a new 66-inch butterfly valve and a new 48 inch Howell Bunger Valve, with associated piping. The valve structure will be approx. 50 feet by 20 feet and will be installed on the bank of Canyon Creek adjacent to where the old outlet valves were removed in Phase 1. Phase 2 is proposed to be constructed in June 2015, during an outage period of Pacific Gas and Electric Company's associated Drum Spaulding Hydroelectric Project. Performance of the work during the outage period will eliminate water leakage through the existing powerhouse and allow Phase 2 to be constructed with minimal flows in Canyon Creek. The new concrete foundation, which will support the valves and piping, will be poured within an area isolated from Canyon Creek, minimizing any potential impacts to water quality.

Contact Information

Jefferey Parks
Agency Name
State Water Resources Control Board
Contact Types
Lead/Public Agency



Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
S:15301,15302, Class 1, 2
Reasons for Exemption
Existing Facilities. Replacement or Reconstruction.

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613.

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