Glen Anne Dam


Glen Anne Dam 

The reservoir is located within the Sespe Formation consisting mostly of soft shale and thin sandstone beds estimated to be about 2,600 feet thick. It is exposed in a broad east-west band across the upper portion of the foothills.

It is variable in character both vertically and laterally. the red and green shales alternate with reddish-tan sandstone beds with the sandstone being more coarse and more prominent in the lower part of the formation.

The formation weathers into a soft sticky clay that is inclined to creep and form surficial slides. It erodes rapidly, and gullies are common on steep slopes. these characteristics are a problem in maintaining road-cuts, ditches, support for pipelines, or any structure placed on steep slopes.

Danger of developing large or deep slides into the reservoir is slight. the slumpage into reservoir results only in minor loss of reservoir capacity and possible turbidity of the water.


RegionFacilities in Mid-Pacific | Mid-Pacific Home Page
CountySanta Barbara
Dam Type
ReservoirGlen Anne
WatercourseWE of Glen Anne Canyon
Location10 mi NW of Santa Barbara
Original Construction1950-1953
Modified Construction
National ID NumberCA10156
Hydrologic Unit Code

Structural Height135.0 ft
Hydraulic Height (Normal Operating Depth at Dam)86.0 ft
Top Parapet (Elevation)
Spillway Crest Elevation385.0 ft
Crest Elevation402.0 ft
Crest Length
Crest Width
Base Width
Volume of Dam Construction Materials
Streambed at Dam Axis299.0 ft
Top of Exclusive Flood Control Pool (Elevation)
Top of Joint Use Pool (Elevation)
Top of Active Conservation Pool (Elevation)385.0 ft
Top of Inactive Conservation Pool (Elevation)
Top of Dead Storage Pool (Elevation)333.5 ft

Hydraulics & Hydrology
Total Water Storage at Elevation
Maximum Water Surface Elevation
Normal Water Surface Elevation385.0 ft
Spillway Type
Auxiliary SpillwayNo
Spillway Capacity at Elevation950 cfs at 393.8 ft
Auxiliary Spillway Capacity at Elevation
Uncontrolled Spillway Capacity at Elevation
Outlet Works Capacity at Elevation40 cfs at 385.0 ft
Diversion Capacity at Elevation
Drainage Area55.0 sq mi
Hydrometeorological Report (HMR)HMR 49
Probable Maximum Flood (PMF) Report

Contact Information
TitleArea Office Manager
OrganizationSouth-Central California Area Office
Address1243 "N" Street
CityFresno, CA 93721-1813
Phone (Office)559-487-5116
OrganizationGoleta Water District
Address4699 Hollister Ave.
CityGoleta, CA 93110-1999
Phone (Fax)805 964-7002
Phone (Office)805 964-6761

Last updated: Jun 04, 2009