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BAREIS MLS

Listing information is being provided by the BAREIS Inc., MLS. IDX information is provided exclusively for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.

All data, photos, visualizations, and information regarding a property, including the property's compliance with state and local legal requirements and all measurements and calculations of area, have been obtained from various sources, and may include such material that has been generated by use of artificial intelligence. Such information and material have not been and will not be verified for accuracy by the listing broker or the multiple listing service, and are not guaranteed as complete, accurate or reliable. Such information and material should be independently reviewed and verified for accuracy. This information and material are intended for the personal use of consumers and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Copyright 2026, Bay Area Real Estate Information Services, Inc. All Rights Reserved.

OF THE NORTH BAY

WATERSHED & ECOSYSTEMS

From the bays of Southern Marin to the rugged coastal rivers of Sonoma, these watersheds form the lifeblood of the North Bay. They shape where towns were founded, how agriculture developed, where floods occur, how wildlife moves, and where drinking water comes from. Long before modern boundaries, they defined Indigenous lands, travel routes, and food systems—and today they quietly determine the long-term resilience of our homes and communities.

Every watershed on this page is a working system: supporting people, farms, wildlife, and infrastructure while responding to climate pressure, sea-level rise, and past land-use decisions. Restoration is not about returning to some imagined past—it is about repairing function, so these systems can again support life into the future.

Why Watersheds Matter to Homeowners

Watersheds are not just environmental features—they are property-defining systems.

  • Flood risk & drainage are governed by historic floodplains, not parcel lines

  • Soil Health is enhanced by natural flooding and we should recognize the value

  • Water supply depends on upstream land management and storage

  • Fire behavior is influenced by vegetation patterns and watershed moisture

  • Property values tend to be higher near healthy creeks, wetlands, and protected open space

  • Insurance costs and permitting increasingly reflect watershed realities

Understanding your watershed means understanding risk, opportunity, and place—the shared root of ecology and economy.

    Detail Photo Here

    Indigenous & Settler History

    For thousands of years, North Bay watersheds were stewarded by Indigenous peoples—most prominently the Coast Miwok in Marin and southern Sonoma, and the Pomo across Sonoma and Mendocino Counties. Villages were located along creeks, estuaries, and seasonal wetlands—places of abundance, not danger.

    Spanish colonization, followed by Mexican ranchos and later American settlement, transformed watersheds through:

    • Large-scale grazing

    • Wetland drainage

    • Logging and milling

    • Creek channelization

    • Dam construction

    Many areas once dismissed as “worthless swamps” are now understood as essential flood buffers and biodiversity engines, prompting one of the largest regional restoration efforts in California.

      Detail Photo Here

      Twelve Watersheds

      1. Richardson Bay Watershed

      The System
      A 21-square-mile, highly urbanized watershed draining Mill Valley, Tiburon, and Belvedere into Richardson Bay—home to some of California’s largest eelgrass beds.

      Human Presence & Land Use
      ~35,000–40,000 residents
      Dense housing, marinas, transportation corridors, shoreline parks.

      Flora & Ecosystems

      • Eelgrass meadows

      • Tidal mudflats

      • Remnant salt marsh

      • Oak woodland uplands

      Fauna
      Harbor seals, bat rays, leopard sharks, herring, shorebirds, herons, egrets.

      History & Restoration
      Historic dredging and anchoring damaged eelgrass. Restoration now includes anchor-out removal and the Bothin Marsh Living Shoreline, allowing tidal marsh migration as sea levels rise.

        Detail Photo Here

        2. Ross Valley (Corte Madera Creek)

        The System
        Drains 28 square miles from Mount Tamalpais through Ross and Larkspur.

        Human Presence & Land Use
        ~25,000 residents
        Suburban neighborhoods built directly on historic floodplains.

        Flora
        Redwood forest (upper watershed), oak woodland, riparian willow and alder.

        Fauna
        Steelhead trout, river otters, deer, raccoons, owls, amphibians.

        History & Restoration
        Decades of flood control hardened the creek. Current projects remove concrete channels, restoring floodplains to reduce flooding and improve fish passage—a shift from control to coexistence.

          Detail Photo Here

          3. Lagunitas Creek & Tomales Bay

          The System
          A 103-square-mile watershed and Marin County’s primary municipal water source, with reservoirs on Mt. Tamalpais and Nicasio Valley.

          Human Presence
          ~8,000–10,000 residents

          Flora
          Coast redwood forest, oak woodland, riparian corridors, tidal marsh.

          Fauna
          Coho salmon, steelhead, river otters, bobcats, migratory birds.

          History & Restoration
          Dams built for water supply blocked salmon runs. Decades of work by SPAWN restored habitat, resulting in the southernmost self-sustaining Coho population on the West Coast.

            Detail Photo Here

            4. Walker Creek

            The System
            A rural watershed draining into north Tomales Bay.

            Human Presence
            ~1,000–2,000 residents

            Flora
            Grasslands, coastal scrub, riparian willow and alder.

            Fauna
            Coho salmon (reintroduced), steelhead, red-legged frogs, raptors.

            History & Restoration
            Historic grazing simplified channels. Modern restoration focuses on flow complexity and monitoring salmon survival via smolt traps.

              Detail Photo Here

              5. Stemple Creek

              The System
              An agricultural watershed draining to the Estero de San Antonio.

              Human Presence
              ~1,500 residents

              Flora
              Grasslands, riparian oak and willow, estuarine wetlands.

              Fauna
              California red-legged frog, shorebirds, waterfowl.

              History & Restoration
              Once degraded by unrestricted grazing, Stemple Creek now showcases carbon farming, riparian fencing, and regenerative ranching as effective habitat restoration tools.

                Detail Photo Here

                6. Salmon Creek

                The System
                A 35-square-mile coastal basin meeting the Pacific at Bodega Dunes, linking Occidental, Freestone, Bodega, and Bodega Bay.

                Human Presence
                ~3,000–5,000 residents

                Flora
                Redwood forest, oak woodland, native grasslands, coastal prairie.

                Fauna
                Steelhead trout, mountain lions, deer, bobcats, river otters, migratory birds.

                History & Restoration
                Unlike dammed systems, Salmon Creek suffers from summer dewatering. Restoration emphasizes water storage over pumping, protecting steelhead flows.

                  Detail Photo Here

                  7. San Rafael, Gallinas & Miller Creeks

                  The System
                  Watersheds draining Marin’s most populous areas.

                  Human Presence
                  80,000+ residents

                  Flora
                  Tidal marsh, riparian forest, oak woodland.

                  Fauna
                  Steelhead trout, Ridgway’s rail, shorebirds.

                  History & Restoration
                  Wetlands were diked and filled. The McInnis Marsh Restoration reopens tidal flow, protecting both wildlife and wastewater infrastructure.

                  8. Novato Creek

                  The System
                  Eastern Marin’s largest watershed (45 square miles).

                  Human Presence
                  ~60,000 residents

                  Flora
                  Freshwater marsh, tidal wetlands, grasslands.

                  Fauna
                  Waterfowl, steelhead, amphibians.

                  History & Restoration
                  Dredging once removed sediment entirely; today it is reused to build ecotone levees, blending flood protection and habitat.


                    Detail Photo Here

                    9. Petaluma River Watershed

                    The System
                    A 146-square-mile tidal river system.

                    Human Presence
                    ~90,000 residents

                    Flora
                    Salt marsh, riparian woodland, grasslands.

                    Fauna
                    Salmonids, river otters, raptors, migratory birds.

                    History & Restoration
                    Before the Golden Gate Bridge, Petaluma was a shipping hub for lumber, eggs, butter, and milk bound for San Francisco. Modern restoration reconnects floodplains upstream.

                      Detail Photo Here

                      10. Sonoma Creek Watershed

                      The System
                      Drains 166 square miles of Sonoma Valley.

                      Human Presence
                      ~70,000 residents

                      Flora
                      Oak savanna, riparian corridors, tidal wetlands.

                      Fauna
                      Steelhead, beaver, waterfowl, songbirds.

                      History & Restoration
                      The Sears Point Restoration returns former hay fields to tidal marsh, while Beaver Dam Analogs restore upstream hydrology.

                        Detail Photo Here

                        11. Laguna de Santa Rosa

                        The System
                        Sonoma County’s largest tributary to the Russian River.

                        Human Presence
                        ~100,000 residents in the basin

                        Flora
                        Seasonal wetlands, oak woodland, riparian forest.

                        Fauna
                        Native fish, amphibians, migratory birds.

                        History & Restoration
                        Tributaries like Santa Rosa Creek were channelized and undergrounded to reclaim floodplain land. Restoration now focuses on invasive removal and wetland function recovery.

                          Detail Photo Here

                          12. Russian River Watershed

                          The System
                          The North Bay’s hydrologic giant (1,485 square miles), beginning in Mendocino County and flowing to the Pacific.

                          Human Presence
                          ~250,000 residents

                          Flora
                          Redwood forest, oak woodland, floodplains, estuary.

                          Fauna
                          Coho salmon, steelhead, mountain lions, black bears (upper watershed), diverse birdlife.

                          History & Restoration
                          Named for Russian fur traders protected by Fort Ross. Major reservoirs—Lake Mendocino and Lake Sonoma—support communities while requiring intensive restoration downstream.

                            Detail Photo Here

                            Closing Reflection

                            Watersheds remember what we forget. Restoration begins with the acts of listening and learning.

                            HAVE ANY QUESTIONS?

                            We're happy to provide more information.

                            More Details

                            Market Data by Area

                            MARIN COUNTY
                            Southern Marin

                            Sausalito, Tiburon, Mill Valley

                            Southern Marin
                            Recent SalesHomes for SaleArea Trends
                            MARIN COUNTY
                            Ross Valley

                            Corte Madera, Kentfield, Fairfax

                            Ross Valley
                            Recent SalesHomes for SaleArea Trends
                            MARIN COUNTY
                            San Rafael

                            Peacock Gap, Terra Linda, Marinwood

                            San Rafael
                            Recent SalesHomes for SaleArea Trends
                            MARIN COUNTY
                            Novato

                            Hamilton, Bel Marin Keys, San Marin

                            Novato
                            Recent SalesHomes for SaleArea Trends
                            MARIN COUNTY
                            West Marin

                            Pt Reyes, Bolinas. San Geronimo

                            West Marin
                            Recent SalesHomes for SaleArea Trends
                            SONOMA COUNTY
                            Petaluma

                            Penngrove, Bloomfield, Lakeville

                            Petaluma
                            Recent SalesHomes for SaleArea Trends
                            SONOMA COUNTY
                            Cotati/Rohnert Park

                            Stony Point, University Park

                            Cotati/Rohnert Park
                            Recent SalesHomes for SaleArea Trends
                            SONOMA COUNTY
                            Santa Rosa

                            Roseland, Bennett Vally, Rincoln Valley

                            Santa Rosa
                            Recent SalesHomes for SaleArea Trends
                            SONOMA COUNTY
                            Sebastopol

                            Graton, Forestville, Occidental

                            Sebastopol
                            Recent SalesHomes for SaleArea Trends
                            SONOMA COUNTY
                            Sonoma Valley

                            Kenwood, Glenn Ellon, Sonoma

                            Sonoma Valley
                            Recent SalesHomes for SaleArea Trends
                            SONOMA COUNTY
                            Russian River

                            Cloverdale, Healdsburg, Guerneville

                            Russian River
                            Recent SalesHomes for SaleArea Trends
                            SONOMA COUNTY
                            Sonoma Coast

                            Bodega Bay, Jenner, The Sea Ranch

                            Sonoma Coast
                            Recent SalesHomes for SaleArea Trends