The Trinity River basin has been degraded by human activities for almost two hundred years, leading to a decline in available salmonid habitat and populations. The Trinity River Restoration Program (TRRP) was created in 2000 to restore salmon and steelhead populations. The project also aims to restore the river through flow management, streambank restoration, and riverbed improvement. 

Ah Pah Creek is a fourth order stream with a 16.3 square mile watershed composed entirely of steep, forested land that was degraded by road and highway construction. Yoruk Tribal Fisheries Program (YTFP) and the California Conservation Corps (CCC) collaborated to address riparian restoration needs within the drainage, including extensive riparian conifer planting in its three major tributaries.

Encompassing some of the wildest and least populated territory in the state, the Klamath region of Northern California faces threats from invasive species in its wildland ecosystems. To protect the forests and rivers, restoration efforts began by applying county-scale mapping tool to identify and treat high-priority eradication target.

Along the Morro Bay, the wetlands, intertidal mudflats, salt and freshwater marshes, eelgrass beds host some of the most productive natural habitats in the world. To protect the ecological significance of estuaries, stakeholders of the Morro Bay National Estuary Program in California worked with resources from the EPA's Climate Ready Estuaries program to identify their climate risks.

The coastal marsh habitat in Blair Island, San Francisco was impaired by construction of salt ponds and dirt levees before its ecological value was recognized. The project aimed to restore the 1, 400 acres of diked marsh to tidal marsh primarily by breaching the perimeter levees to allow tidal action via surrounding slough channels.

The West Fork San Luis Rey River on Palomar Mountain, in Southern California hosts a population of native Coastal Rainbow Trout (Oncorhynchus mykiss irideus) that were threatened by the invasive Black Bullhead (Ameiurus melas). After two years of work, biologists from the California Department of Fish and Wildlife achieved complete bullhead eradication within this stream.  

A team of nonprofit organizations and government agencies led by the California State Coastal Conservancy developed preliminary design plans to use a gravel beach and berm in the Eden Landing Ecological Reserve to protect critical habitat, control erosion, and enhance shoreline resilience on the south San Francisco Bay.

The San Clemente Dam on the Carmel River was no longer useful due to sedimentation of the reservoir, and was declared a public safety hazard in the 1990s. This project removed the dam and restored the Carmel River’s floodplain and habitat. This improved habitat and connectivity for wildlife, including the threatened steelhead.  

The Salton Sea, as the largest lake in California, is an important habitat for migratory birds on the Pacific flyway. The habitat is threatened by decreased water levels and increased salinity and selenium levels. This project created an experimental complex to try and create shallow saline habitat ponds as suitable habitat for wildlife. 

The Mohave tui chub (Siphateles bicolor mohavensis = Gila bicolor mohavensis) is a federally endangered species that was native to the Mojave River, however now only exists in natural and man-made refuges. This project aims to establish and maintain refuges for the fish to promote recovery. 

A dam placed in Dry Creek in Sonoma County, California degraded important fish habitat. Instead of building an expensive and unattractive bypass pipeline, the Dry Creek Ecosystem Restoration Project restored 30 hectares of stream, floodplain, and riparian habitat. This project increased in-stream habitat complexity and improved hydrologic connectivity with the floodplain.  

This project is testing the effectiveness of dune restoration as a tactic for combatting sea-level rise and erosion in Southern California. Sand dunes were constructed from locally dredged material and planted with native vegetation. It is projected that this project will successfully protect the shoreline from flooding with no additional sand maintenance until 2050.  

The Dutch Slough project is a large-scale tidal marsh restoration, habitat enhancement and open space preservation project in the rapidly urbanizing area of eastern Contra Costa County. The 1,166-acre site was purchased in 2003, and adaptive management interventions were planned as experiments to study how the ecosystem functions and how best to achieve the restoration objectives.

This project is a large-scale, multi-agency Effort to eradicate the infestations of the invasive strain of the tropical marine alga, Caulerpa taxifolia from two sites in California. At the time when no technique had been demonstrated effective to treat the infestations, the team chose to apply chlorine bleach treatment.

Intensive campground use at the Grant Grove area of Kings Canyon National Park, California, has compacted the soil and left areas without understory vegetation or tree recruitment. To better inform the restoration of these sites after closure, natural regeneration potential was tested against planting and soil restoration methods.

To restore forest health and an ecological and climate-adapted fire regime, staff at Lassen Volcanic National Park (LAVO) in northern California partnered with the Sierra Nevada Conservancy and Sierra Institute in 2019 to reduce forest fuel loads within wilderness areas of the North Fork Feather River watershed.

A partnership between the California Coastal Commission and the California Department of Transportation (Caltrans) is working to improve understanding of transportation critical infrastructure vulnerabilities to sea level rise and to adapt the transportation system for greater resilience to those changing conditions over the next century. 

A partnership between the BLM, Sacramento Water Forum, and USFWS is working to restore spawning conditions and salmonid habitats in the Lower American River downstream of the Folsom Dam. The plan focuses on enhancing gravel habitat, adding woody material, and creating side channels and floodplains for spawning and rearing Chinook salmon and steelhead.

The Hamilton Wetlands Site, just north of San Francisco, was diked and dried almost a century ago for commercial development. This loss of marsh impacted endangered species and lessened the area’s coastal resilience. This project is restoring marsh functions and ecosystems, as well as creating recreational opportunities. 

The Lower Elkhorn Basin Levee Setback (LEBLS) Project is working to increase flood resiliency and ecosystem benefits in California’s central valley. For this project, the California Department of Water Resources (DWR) constructed a 11,500-meter setback levee to expand the Sacramento and Yolo bypasses by about 450 meters.