Calaveras River / Budiselich Flashboard Dam Fish Passage Improvement

Budiselich Flashboard Dam is located within the Stockton Diverting Canal, just upstream of the Highway 99 Bridge on the eastern boundary of the City of Stockton (see map (PDF, 96KB)). The dam is composed of a 12-feet-wide flat concrete foundation spanning 98 feet between concrete abutments. During the irrigation season, flashboards are installed to impound water.

The project consisted of alterations to the channel downstream of the dam’s foundation, which was designed to allow fall-run Chinook salmon and steelhead to easily migrate upstream. The design (PDF, 5.6 MB) is comprised of 7 arched boulder weirs buried in engineered streambed material (cobbles, gravel, sand, and silt), creating a rock ramp roughened channel. The rock ramp has a 10-feet-wide low-flow channel and a 3 percent longitudinal gradient, which is a milder slope than the pre-project channel, creating lower velocities, and less turbulence in the channel. It also provides enough water depth allowing fish to navigate more easily upstream of the project site. The project extends 250 feet downstream of the foundation and has a maximum width of about 125 feet. The project was designed to meet regulatory agency criteria at all flows greater than 30 cubic feet per second (cfs). After the project was completed, fish were seen moving upstream in the low-flow channel and approximately 400 adult fall-run salmon were estimated to have passed the project site in late 2011.

In 2013, the project received a Distinguished Project Award (Honorable Mention) from the American Society of Civil Engineers, Environmental and Water Resources Institute /American Fisheries Society, Bioengineering Section Joint Committee on Fisheries Engineering and Science.


Is this an Active Project or Completed Project? Completed

Is this an Ecorestore Project? No

Watershed: Calaveras River

Public Access: No

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