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Stream Maintenance Program

The water district’s Stream Maintenance Program ensures flood protection projects continue to function as designed to protect homes and businesses along water district streams. These projects remove homes and businesses from FEMA designated flood zones, and in addition to flood risk reduction activities, save residents countywide over $2 million in flood insurance premiums each year.

  • The water district owns 278 miles of streams in our county, but only a portion of them have been improved with flood protection projects. Those are the streams that get maintenance projects.

Each year district crews inspect stream and bank conditions, especially after storms. Toward the end of the rain season, staff identify maintenance projects for the upcoming work season.

From June to October, our crews trek into streams to remove sediment, manage vegetation, clear trash and debris, and stabilize banks that have been eroded. While the heavy work takes place in the summer, stream maintenance is a year-round effort.

During heavy storms, unruly vegetation and sediment washed down from areas upstream can restrict the flow of water and in some areas, cause a back-up, increasing the risk of flooding. District crews monitor known “hot spots” for vegetation and debris buildups and where needed, take action to remove these blockages and reduce the threat of localized flooding.

Stream maintenance work provides other benefits in addition to flood protection. Removing invasive vegetation, weeds and dry brush improves habitat for wildlife and a healthy stream ecosystem, contributes to improved flows in creeks, and even reduces the risk of fire hazards along neighboring properties.

Recent Stream Maintenance Program projects:
(Click thumbnails to enlarge)

San Tomas
Sediment Project

San Tomas B-A

Bank Project

Regnart B-A

Sediment Project

Berryessa B-A

2014‐2023 Stream Maintenance Program Manual
Authorization permits

Stream Maintenance Report
(Sept. 26 - Oct. 9, 2017)

SMP Report archive

Final EIR (2012)
Where are district crews working this week? Check the current Neighborhood Work Notices
Learn about our Good Neighbor Program

FACT SHEET: Trees and district right-of-way 

If you observe a problem in any creek in our service area, you can report it on our "Access Valley Water" online customer request and information system.

AVW link

This is the best way to alert our field crews of downed branches, eroding banks, trash, graffiti or overgrown vegetation.