Reference Layer Programs - Hydrography

CDWR Water Data Library (WDL)

Shows the locations of continuous and discrete water quality monitoring sites managed by the California Department of Water Resources (CDWR). The purpose of this dataset is to link back to a database of detailed water quality information that is available for download for each site.

California Environmental Data Exchange Network

The California State Water Resources Control Board California Environmental Data Exchange Network (CEDEN) is a system designed to facilitate the integration and sharing of California's water resource monitoring data collected by many different participants. The purpose of this dataset is to show locations of water quality, toxicity, tissue, and benthic monitoring stations and to link back to a database of detailed information that is available for download.

California Hydrography

California Hydrography datasets fulfill California's need of hydrography for visualization and mapping, as well as a common spatial base for in depth analysis of multiple data sets.

California Interagency Watershed Map of 1999

Calwater 2.2.1 standardizes the boundary delineation, coding, and naming of California watersheds by government agencies.

Groundwater Basins

Displays the boundaries of groundwater basins and subbasins as defined by the California Department of Water Resources.

Hydrologic Units

A Hydrologic Unit Code (HUC) is a unique code, consisting of two to eight digits, used to identify watersheds based on the United States Geological Survey's four-level classification system.

USGS Gaging Stations

This dataset documents the location of USGS active and historical streamgages. Detailed flow data can be accessed through a link to the detailed USGS database found in the feature attributes.