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Napa River Basin
With the exception of a small portion in Solano County, the Napa River Watershed is almost entirely within the boundaries of Napa County. It is contained by Mt. St. Helena to the north, the Mayacamas Mountains to the west, Howell Mountain, Atlas Peak, and Mt. George to the east, and the Napa-Sonoma Marsh to the south. The Napa River runs through the center of the watershed on the valley floor, draining numerous tributaries along a 55 mile run from high in the headwaters of Mt. St. Helena to the San Pablo Bay.
The Napa River winds through varied landscapes of forested mountain slopes, vineyards, urban areas, open pasture, grasslands, industrial zones, and marshes. The Napa River Watershed is home to most of the residents and developed areas in the county. It is estimated that 95% or more of the entire population of Napa County live in the Napa River Watershed. Reservoirs in the watershed include Lake Hennessey, Lake Milliken, and Bell Canyon Reservoir. This watershed also provides many different habitats for fish and wildlife, including chaparral, brackish and salt water marsh, vernal pools, forests, oak woodlands, grasslands, and riparian and freshwater communities.
Source: Napa County Resource Conservation District
