Peyton Slough Watershed

Peyton Slough Watershed

The Peyton Slough watershed is composed of urban Peyton Creek and some minor tributaries, managed runoff from the Shell Oil Refinery located west of I-680, urban runoff from the relatively small Arthur Road neighborhood east of I-680, as well as drainage from portions of I-680 itself. The watershed includes Martinez Reservoir, the terminal reservoir of the Contra Costa Canal.  Martinez Reservoir has a spillway connected to Peyton Creek. Peyton Creek is a highly modified urban creek with a combination of open concrete channels, natural channels, and a 1,000-foot-long underground concrete culvert through the Shell Oil Refinery property. Peyton Creek is an intermittent stream, mostly drying up by the summer.

Contact Heidi Petty for more information

The Peyton Slough Wetlands Advisory Committee and McNabney Marsh -A Brief History-

The Peyton Slough Wetlands Advisory Committee (Committee) got its start during the Shell Martinez Refinery oil spill cleanup effort at Shell Marsh in 1988. Community involvement in the cleanup led to forming the Shell Marsh Technical Advisory Committee. The California Department of Fish and Wildlife (CDFW), Contra Costa Mosquito and Vector Control District (CCMVCD), and Mt. View Sanitary District (MVSD) took the lead early on by creating clear goals and objectives for managing the 138-acre seasonal wetland. The Committee was particularly well guided by Mike Rugg, biologist with CDFW (previously California Department of Fish and Game), in the formation of a Management Plan.

The Committee members honored Al McNabney, a founding member of the group and a representa­tive for the Mount Diablo Audubon Society, by naming the marsh in honor of his tireless efforts to protect the site as wildlife habitat. In 1992 the advisory group became the McNabney Marsh Management Advisory Committee. In 2006, the group was renamed the Peyton Slough Wetlands Advisory Committee, and MVSD and CDFW’s Office of Spill Prevention and Response (OSPR) cur­rently co-chair the organization. As of January 2020, the PSWAC is made up of representatives from the following organizations:

  • CDFW
  • Contra Costa Resource Conservation District
  • Ducks Unlimited
  • East Bay Regional Park District
  • Eco Services
  • Marathon Petroleum
  • Mount Diablo Audubon Society
  • MVSD
  • Shell Martinez Refinery.

The Committee’s goals for McNabney Marsh include enhancing wetland habitats, controlling mosquitoes and algae, improving water quality, reducing flood risk, and improving public access. MVSD and Ducks Unlimited are spearheading the effort to fund the McNabney Marsh Enhancement Project, an estimated $7 million effort to improve water and habitat quality through the replacement of a Union Pacific Railroad bridge over Peyton Slough to allow greater water exchange in the marsh. Other planned habitat enhancements include the replacement/upgrade of water control structures, the importation of clean sediment to raise the marsh plain, improvement of levees, invasive plant removal, and the creation of earthen islands to increase ground nesting habitat for shorebirds and waterfowl.

Heidi Petty


Heidi Petty

Skills: Watershed management and coordination, grant writing, fundraising, events.

Fun Fact: Owns a marina, small urban farm, and a Scottish Highlander cattle ranch in the Delta.  Loves music and silly hats!

Heidi Petty

Heidi Petty has been with the CCRCD since 2007. Her current position is Watershed Program Manager and Fundraising Coordinator, focusing on the Contra Costa side of the Carquinez Strait shoreline. In 1999, Heidi started a small bonsai and custom saltwater reef tank business named ‘Through the Looking Glass: A Living Art Studio’ in Crockett, CA, where she got an in-depth understanding of saltwater filtration and hydrology. Heidi has held numerous community leadership positions in the Crockett, Port Costa, and Rodeo area, including President of the local Chamber of Commerce and Board Member on the Crockett Community Services District. Her entrepreneurialism and government service background makes her a valuable asset to the RCD as a special government district. 

 She now lives on the river in Oakley, CA, and owns a marina and small urban farm as well as a 28-acre Highlander Cattle Ranch in the SF Delta. She is excited to expand her work by partnering with the technology industry to create innovative ways to help the environment through long-term partnerships and connecting tech to her restoration work.