Tinemaha Dam Geotechnical Investigation


SCH Number
Public Agency
Los Angeles Department of Water and Power
Document Title
Tinemaha Dam Geotechnical Investigation
Document Type
NOE - Notice of Exemption
Document Description
LADWP proposes to conduct geotechnical investigations in the vicinity of the Tinemaha Dam under the supervision of the Division of Safety of Dams. Built in the 1920s, there are several issues with the dam and appurtenant works which will eventually require replacement. The proposed geotechnical work will investigate the geology and hydrogeology surrounding the dam and reservoir and be used to inform how the dam will be replaced as a future project. The investigation would involve borings, test pits, and cone penetration testing. Test pits would be conducted in the proposed borrow sites (see attached).

Contact Information

Jane Hauptman
Agency Name
Los Angeles Department of Water and Power
Contact Types
Lead/Public Agency

Agency Name
Los Angeles Department of Water and Power (LADWP)
Contact Types
Project Applicant


Other Location Info
Tinemaha Reservoir is located in Inyo County, situated on the Owens River approximately 8 miles south of Big Pine, California. Please see attached figures.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
15301 Existing Facilities; 15306 Information Collection
Reasons for Exemption
Section 15301 - Existing Facilities consists of the operation, repair, maintenance, permitting, leasing, licensing, or minor alteration of existing public structures involving negligible or no expansion of existing or former use. Section 15301 (m) includes minor repairs and alterations to existing dams and appurtenant structures under the supervision of the Department of Water Resources. Section 15306 - Class 6 consists of basic data collection, research, experimental management, and resource evaluation activities which do not result in a serious or major disturbance to an environmental resource. These may be strictly for information gathering purposes, or as part of a study leading to an action which a public agency has not yet approved, adopted, or funded.


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