Napa Valley AVA

Major roads within Napa County. This is a subset of the roads layer. Road segments were selected for aesthetic purposes and not based on functional classifications.

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Holdings of the Sonoma County Agricultural Preservation and Open Space District. Includes conservation easements, open space easements conveyed to Ag + Open Space through the County of Sonoma planning process, and Ag + Open Space fee properties. This dataset represents Ag + Open Space's current portfolio of protected lands. Superseded projects (e.g. former fee properties since transferred, easements since amended or rescinded and replaced) are housed in a separate dataset.

Drainages (watershed subbasins) The subbasin delineations were based off Napa County's prior planning subbasins (https://www.napacounty.gov/DocumentCenter/View/2635/Napa-County-Watershed-Map-PDF).This layer was made by Environmental Science Associates (ESA) as part of Napa County's 2025 Baseline Data Report.  High quality Digital Elevation Model's (DEM) were combined to fully delineate subbasins. The Napa County Streams layer was used to burn streams into the DEM to ensure that subbasin delineations were consistent with the County's streams layer. Raw catchments generated with the ArcGIS Pro hydrology toolset were subsequently merged together as necessary to adhere to original planning drainages. In cases where planning drainages were subdivided in greater detail then was delineated in the raw catchment layer, ESA defined pour points to manually delineate planning drainages using the "Subwatershed Delineation" geoprocessing tool. ESA worked with the County to identify areas requiring additional refinement, and further refined delineation based on a review of the delineation against satellite imagery, Google Earth Street View, and the DEM"s contour/ hillshade.

Labels

County Subdivisions, Subbarrios, Consolidated Cities, Incorporated Places, Census Designated Places, and Economic Places; January 1, 2012 vintage; Generalized