The National Oceanic and Atmospheric Administration (NOAA) defines a "watershed" as a "land area that channels rainfall/snowmelt to creeks, streams, and rivers, and eventually to outflow points such as reservoirs, bays, and the ocean." Our watersheds define more than habitat, they define where we live. They influence rainfall patterns, the types of trees and plants we see, and how we define the cities and towns of the county.

Learn about

  • How our watersheds function
  • Creeks and habitats
  • Flooding and flood protection
  • What you can do to be a steward of your watershed

Watersheds of Marin

Marin County is made up of 14  major watersheds with over 3000 miles of creeks flowing through them. However, not all of the watersheds contain flood control zones.

Watersheds with flood control zones have:

  • Funding from ad-valorem taxes, fees and/or assessments
  • Advisory boards
  • Projects and maintenance activities

Map of marin county showing the 14 watersheds.

Watersheds with flood control zones

Watersheds without flood control zones

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