Building Resilience Together: The Future of the Russian River Watershed
Welcome to the Russian River Watershed Resilience site — your hub for collaboration, innovation, and action. Here, we’re working together to address climate challenges, protect vital water resources, and create a sustainable future for our communities and ecosystems.

Watershed Resilience Program

To strengthen California’s ability to adapt to climate change, the Department of Water Resources (DWR) launched the Watershed Resilience Program as part of the 2023 California Water Plan. This program emphasizes the need to assess climate risks at the watershed scale and develop strategies that address those challenges through collaboration and integrated solutions. It builds on the foundation of the Integrated Regional Water Management (IRWM) Program, deepening its focus on climate vulnerability assessments, adaptation planning, watershed-scale coordination, and equity. The program also prioritizes cross-sector collaboration across water supply, flood management, groundwater, water quality, forest and fire resilience, ecosystems, and land use. Initial funding from the 2021 and 2022 Budget Acts enabled DWR to launch five two-year pilot planning projects. These pilots are applying and testing the watershed resilience approach in diverse regions across the state, laying the groundwork for future efforts.

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Funding for this project has been provided in full or in part from the Budget Act of 2022 and through an agreement with the State Department of Water Resources.

Pilot Watersheds Include

Pilot watersheds receive funding and guidance from DWR to convene broad, inclusive watershed networks of local agencies, Tribal governments, community leaders, non-profit organizations and other partners. DWR envisions equity and inclusion as being a critical focus for watershed networks. These locally-led networks collaborate across their watershed to quantify their greatest climate vulnerabilities, and develop multi-benefit adaptation strategies and projects to increase climate change resilience. Lessons learned from these pilots will inform future State funding programs. If additional funding becomes available, DWR intends to incentivize this watershed resilience approach in other watersheds throughout the State.

Managing water

Managing water from headwaters to outflow across entire watersheds.

equity

Centering equity and inclusiveness in all water decisions.

Analyzing

Assessing climate risks and watershed adaptation strategies effectively.

Collaborating

Collaborating across water, land, fire, and ecosystem-related sectors.

metrics

Developing outcome metrics for regional and statewide tracking.

Pilot Overview

The Russian River Watershed Resilience Pilot, led by the Sonoma County Water Agency (Sonoma Water), is a $2 million initiative funded by the California Department of Water Resources (DWR) to develop a climate-resilient management plan for the 1,500-square-mile watershed. The pilot study area supports over 700,000 people, 238 streams, and critical habitats for endangered salmonids. The pilot aligns with California’s Water Plan Update 2023 and focuses on:

  • Climate Vulnerability Assessment: Quantifying risks from reduced snowpack, drought, floods, and sea level rise.
  • Multi-Sector Integration: Coordinating water supply, flood management, ecosystems, and land use planning across jurisdictional boundaries.
  • Equity-Centered Planning: Engaging Tribes, disadvantaged communities, and agricultural stakeholders in decision-making.
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Study-area-map

Study Area

The proposed study area adopts the HUC-8 Russian River watershed boundary as defined in the California Watershed Resilience Assessment (DWR, 2024), with an expansion to include adjacent areas that receive Russian River water. This expanded boundary encompasses the entire Russian River watershed and its associated groundwater basins, including key hydrologic features such as Lake Mendocino, Lake Sonoma, and the Laguna de Santa Rosa, as well as the Potter Valley, Ukiah Valley, Santa Rosa Plain, and Alexander Valley groundwater basins. In addition, the study area includes “plus” areas—regions outside the watershed that rely on Russian River water—such as portions of the North Bay watershed served by Sonoma Water. These include the Sonoma Valley and Petaluma Valley groundwater basins, and service areas in Petaluma, Valley of the Moon, Sonoma, Novato, and San Rafael. Including these areas ensures that the study captures the full range of hydrologic and hydrogeologic conditions that influence water supply, infrastructure, and communities dependent on the Russian River system.

Watershed Overview

The Russian River watershed is a crucial resource for Northern California, supplying drinking water to more than 700,000 residents across Sonoma, Mendocino, and Marin counties, including numerous Native American Tribes. Stretching approximately 110 miles from its headwaters in the Redwood and Potter Valleys to its mouth at the Pacific Ocean in Jenner, the Russian River and its watershed encompass almost 1,500 square miles. This region features a rich mosaic of forests, agricultural lands-most notably vineyards-wetlands, and urban communities. Major tributaries such as Dry Creek, Mark West Creek, and the Laguna de Santa Rosa contribute to the river’s flow and ecological diversity. Water storage and flood protection are provided by Lake Mendocino and Lake Sonoma, two major reservoirs that are vital for municipal, agricultural, and environmental needs. The river supports a wide range of fish and wildlife, including 34 species of fish with endangered salmon and steelhead among them, and serves as a major recreational and economic asset for the region. The health and resilience of the Russian River watershed are central to sustaining the environment, local economies, and quality of life for the communities that depend on it.

History

Indigenous Era

Before European settlement, the watershed was home to numerous Native American tribes, including the Pomo, Wappo, and Miwok. These communities sustainably managed the land and water, relying on the river for fish, plants, and transportation. Their stewardship practices, such as controlled burns and careful harvesting, helped maintain the watershed’s ecological balance.

European Settlement

In the 19th century, Russian fur traders established settlements near the coast, giving the river its current name. American settlers followed, transforming the landscape through logging, agriculture, and urbanization. Over time, the watershed became a vital resource for farming—especially vineyards—and for the growing populations of Sonoma and Mendocino counties.

Modern Era

Today, the Russian River watershed is a critical environmental and economic resource. It supplies drinking water to over 600,000 people, supports agriculture, and draws nearly a million recreational visitors annually. The region faces new challenges, including climate change, drought, floods, and the need to protect endangered species and water quality.

Watershed Resources and Water Management

The Russian River watershed faces a complex set of water resource management challenges, shaped by both its natural setting and the accelerating impacts of climate change. Water supply in the region is under mounting stress due to recurring droughts, hotter temperatures, and shifting precipitation patterns. The area relies heavily on surface water from reservoirs like Lake Mendocino and Lake Sonoma, but these supplies are increasingly vulnerable to reduced inflows and rising demand from urban, agricultural, and environmental needs. 

Water Supply

The Russian River watershed is a vital water source for Northern California, encompassing about 1,500 square miles across Mendocino and Sonoma counties.. The water resources of the Russian River watershed serve as the region’s principal water source, supplying over 700,000 residents in Sonoma, Mendocino, and Marin counties. Water from the Russian River supports a wide range of uses, including residential, commercial, agricultural, and environmental needs. Russian River water is stored in major reservoirs like Lake Mendocino and Lake Sonoma which are critical for maintaining water supply and minimum stream flows, especially during dry periods.

Groundwater

Groundwater is a critical part of the Russian River watershed’s water supply, supporting homes, farms, and businesses across Sonoma and Mendocino counties. Many residents-especially those in rural areas-depend on wells for their drinking and irrigation water, while agriculture and municipal systems also rely on groundwater to meet demand when surface water is scarce. Climate change is expected to reduce natural recharge rates due to less frequent and more intense precipitation events, increased evaporation, and shorter, warmer winters. 

Flood Management

Atmospheric rivers are responsible for over 99% of flood damages in Sonoma County, with all major Russian River floods since 1997 linked to these events. The lower Russian River’s narrow floodplain and steep terrain accelerate and deepen floodwaters, increasing risk to communities like Guerneville and Monte Rio. Flooding is compounded by sedimentation from upland erosion and post-fire runoff, which reduces channel capacity and increases the likelihood of levee overtopping and infrastructure damage. Flood management is further complicated by aging infrastructure and high-risk development in flood-prone areas.

Ecosystems

Ecosystems in the Russian River watershed are fundamental to the region’s health and resilience, providing a wide array of benefits that support both people and nature. In the upper reaches, ancient redwood forests and oak woodlands provide habitat for a variety of plants and animals, while lush riparian corridors along the riverbanks help filter water, stabilize soils, and offer critical refuge for endangered coho salmon and threatened steelhead trout (California Department of Fish and Wildlife, 2023; Sonoma County Water Agency, 2024). Wetlands and floodplains, including those restored in the lower watershed, enhance biodiversity, reduce flood risks, and serve as important stopovers for migratory birds (NOAA Fisheries, 2024). These interconnected habitats also sustain unique species such as Pacific lamprey and California roach, and iconic redwoods protected in parks like Armstrong Redwoods State Natural Reserve (California State Parks, 2024). Ongoing conservation efforts by local agencies, conservation groups, and federal partners aim to balance ecological health with community needs, ensuring that the Russian River’s ecosystems continue to provide clean water, recreation, and resilience against climate change (Sonoma County Water Agency, 2024; NOAA Fisheries, 2024). Ecosystem health in the Russian River watershed is directly threatened by climate-driven changes such as warmer stream temperatures, reduced flows, and increased sedimentation—especially after wildfires and during drought. These conditions have led to documented strandings and mortality of endangered salmon and steelhead in tributaries like Mill Creek, Green Valley Creek, and Dutch Bill Creek during dry years, while post-fire sediment runoff, such as after the Walbridge Fire, has degraded critical habitats and increased risks to aquatic life.

Water Quality

Many waterbodies in the Russian River watershed are listed under Clean Water Act Section 303(d) due to water quality impairments caused by several different pollutants. The Russian River watershed is impaired for sediment and temperature as well as pathogen, mercury, phosphorus, and dissolved oxygen impairments identified in waterbodies throughout the watershed. Water quality is at risk from a combination of drought, wildfire, and agricultural runoff. Drought concentrates pollutants and nutrients, increasing the likelihood of harmful algal blooms and degraded drinking water. Post-fire runoff increases sediment and ash in waterways, threatening both water supply (notably Lake Sonoma’s drinking water) and aquatic species.

Recreation

The Russian River is a major recreational asset for the region. Visitors and locals enjoy canoeing, kayaking, tubing, and even some whitewater rafting along the river’s scenic stretches, while over 100 miles of trails invite hikers, runners, mountain bikers, and horseback riders to explore the region’s redwoods and rolling hills. Fishing is a popular activity, and several beaches-including Johnson’s Beach and Memorial Beach-provide great spots for swimming, picnicking, and relaxing by the water.  Recreation is closely tied to watershed health. Floods, droughts, and wildfires can restrict access, degrade water quality, and reduce opportunities for boating, fishing, and other activities.

Hydropower

Within the Russian River watershed, hydropower is generated from water released from Lake Mendocino at Coyote Valley Dam at from Lake Sonoma at Warm Springs Dam. The hydropower generation at each of these dams is primarily opportunistic, subject to releases for water supply, flood management, and instream flow purposes. The Russian River watershed has long relied on the Potter Valley Project (PVP) to bring water from the Eel River and generate clean, renewable hydropower for our communities. For nearly a century, the Potter Valley Project (PVP) has imported water from the Eel River to generate clean, renewable hydropower.  The PVP includes Scott Dam and Cape Horn Dam in the Eel River watershed, and the Potter Valley Powerhouse in the Russian River watershed. However, PG&E stopped generating power at the facility in 2021 and is now in the process of removing the dams and retiring the project.

Equity

The Russian River Watershed is home to a diverse group of people, including over half a million residents across Mendocino, Sonoma, and Marin counties, as well as dozens of Native American tribes who have lived alongside the river for millennia. Climate hazards disproportionately affect vulnerable and disadvantaged communities, particularly those reliant on groundwater or living in high-risk flood and fire zones. Many residents of lower Russian River towns like Guerneville, Monte Rio, and Villa Grande live in the 100-year floodplain, where frequent flooding can isolate neighborhoods, disrupt access to food, medical care, and emergency services, and damage homes that often lack adequate insurance or resources for recovery.

Resilience Planning Process

The pilot applies a five-step adaptive framework. This structure reflects the pilot’s integration of DWR’s statewide resilience framework with locally tailored priorities documented in Sonoma Water’s Climate Adaptation Plan and stakeholder-driven sustainability efforts.

1. Set The Stage
2. Explore Hazards
3. Assess Vulnerabilities
4. Develop Strategies
5. Implement and Monitor

Resilience
Resilience Planning Process Figure

Resources & Data

To support our work and ensure transparency, we provide a comprehensive collection of resources and data that inform our approach and outcomes.

Resources

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