Lafayette Reservoir Erosion Control – Lafayette CA


The view of the Lafayette Reservoir from Mount Diablo is framed by Monterey pines, softening the massive dam. The Civilian Conservation Corps (CCC) planted these trees in the mid-1930s to stabilize the slopes around the dam and to prevent silting and soil erosion of the watershed.

Construction began in 1927, when the Lafayette Reservoir was developed by the East Bay Municipal District (EBMUD) to supplement local water supplies.

The original earthen dam collapsed in September 1928, creating cracks across its crest and face. Subsequent investigations found that the wrong type of soil had been used to build the structure. With officials on edge following the March 12, 1928 collapse of the St. Francis Dam in Los Angeles County, which killed 600 people, work on the Lafayette dam stopped for three years, as engineers redesigned the structure.

It was completed in 1933 as a shorter and wider structure, holding only one third of its originally planned capacity.

During the mid-1930s, three CCC camps attached to the Soil Conservation Service (SCS) worked with EBMUD to improve the watershed. This included building roads, constructing erosion control features, protecting stream banks, planting trees, and clearing forests and undergrowth for fire protection. In 1934, as part of the program, the CCC planted mixed pine and Douglas fir along the slopes of San Pablo Reservoir. A year later, the SCS started 5,000 Monterey pine seedlings for use at other reservoirs. Many of these pines, a non-native to the area, were used to stabilize the slopes around Lafayette Reservoir. As of 1940, the program had planted 57,000 trees within EBMUD’s holdings.

The pines at the Lafayette Reservoir later became an amenity when it opened to public as a recreational area in 1964. Nearly 80 years old, the Lafayette Reservoir Monterey pines are nearing the end of their life cycle. While supporting wildlife, the pine stands exhibit little natural regeneration. Currently, a forest thinning program is removing some of them at the reservoir. Similar stands of trees planted by the CCC eight decades ago at other EBMUD facilities are slated for elimination under district’s Watershed Master Plan.

Source notes

Brown, Carl B. The Control of Reservoir Silting. Washington, D.C.: United States Government Printing Office, 1944. 

Jones & Stokes Associates, Inc.  East Bay Watershed Master Plan. Prepared for East Bay Municipal District, 1996. 

McCosker, Mary and Mary Solon. Images of America: Lafayette. San Francisco: Arcadia Publishing, 2007.

Oakland Tribune. February 28, 1934, C-13.

Project originally submitted by John Murphey on July 15, 2015.

We welcome contributions of additional information on any New Deal project site.

Location Info

Click to open Map

3849 Mt Diablo Blvd.
Lafayette, California 94549

Location notes: Lafayette Reservoir

Coordinates: 37.884793, -122.145527

One comment on “Lafayette Reservoir Erosion Control – Lafayette CA

  1. Will these trees be replaced with native species?

Leave a Reply

Before leaving a comment, please note that the Living New Deal does not have the resources to provide research services; the information we have on this page is likely to be all the information we have for this site. If you have additional information or photos to share with us, please send them to [email protected]. Although we can sometimes assist you here, our comments section is mainly intended for visitors to share information with one another. We are not involved in the management of New Deal sites and have no information about visits, hours or rentals.

We welcome contributions of additional information on any New Deal project site.

Your email address will not be published.

This site uses Akismet to reduce spam. Learn how your comment data is processed.