HUC8 CA Simplified
type: Dataset
description: The Watershed Boundary Dataset (WBD) is a seamless, national hydrologic unit dataset. Hydrologic units represent the area of the landscape that drains to a portion of the stream network. (https://www.usgs.gov/national-hydrography/watershed-boundary-dataset) It is maintained by the U.S. Geological Survey (USGS) in partnership with the states. The Department of Water Resources is the steward for the California portion of this dataset. The hydrologic units (HU) in the WBD form a standardized system for organizing, collecting, managing, and reporting hydrologic information for the nation. The HUs in the WBD are arranged in a nested, hierarchical system with each HU in the system identified using a unique code. Hydrologic unit codes (HUC) are developed using a progressive two-digit system where each successively smaller areal unit is identified by adding two digits to the identifying code the smaller unit is nested within. WBD contains eight levels of progressive hydrologic units identified by unique 2- to 16-digit codes. The dataset is complete for the United States to the 12-digit hydrologic unit. The 8-digit level unit is often referred to as HUC8 and is a commonly used reference framework for planning and environmental assessment. This particular version of the dataset was created by downloading the CA State extract of the National Hydrography Dataset from the USGS website https://www.usgs.gov/national-hydrography/access-national-hydrography-products and then performing a geoprocessing operation in ArcGIS Pro software to clip the HUC8s at the state of California political boundary. (https://data.cnra.ca.gov/dataset/california-county-boundaries2). A web map service was created with this dataset, but at it's original digitized resolution it can take a long time to render in a web map application. This dataset is a simplified version, created by use of the ArcGIS Simplify Polygon tool with the Douglas-Peucker Line simplification algorithm, reducing the vertex count from…
keyword: amerigeo
keyword: amerigeoss
keyword: california-department-of-water-resources
keyword: ckan
keyword: dwr
keyword: geo
keyword: geoss
keyword: huc
keyword: hydrologic
keyword: hydrologic-unit
keyword: national
keyword: north-america
keyword: subbasin
keyword: united-states
keyword: watershed
keyword: watershed-boundary-dataset
keyword: wbd
issued: 2022-02-02T20:02:36+00:00
modified: 2022-02-02T20:47:26.650000+00:00
theme: {"Natural Resources"
theme: Water}
contact point: Organization

US Migrating
type: Agent

ArcGIS Hub Dataset
type: Distribution
format: HTML
access URL: https://gis.data.cnra.ca.gov/maps/02ff4971b8084ca593309036fb72289c_0
issued: 2022-06-23T00:49:38.029851
modified: 2025-11-22T06:48:35.944579

ArcGIS GeoService
type: Distribution
media type: application/octet-stream
format: ArcGIS GeoServices REST API
access URL: https://services.arcgis.com/aa38u6OgfNoCkTJ6/arcgis/rest/services/HUC8_CA_Simplified/FeatureServer/0
issued: 2022-06-23T00:49:38.029858
modified: 2025-11-22T06:48:35.945019

GeoJSON
type: Distribution
media type: application/geo+json
format: GeoJSON
access URL: https://gis.data.cnra.ca.gov/datasets/02ff4971b8084ca593309036fb72289c_0.geojson
issued: 2022-06-23T00:49:38.029861
modified: 2025-11-22T06:48:35.945431

CSV
type: Distribution
media type: text/csv
format: CSV
access URL: https://gis.data.cnra.ca.gov/datasets/02ff4971b8084ca593309036fb72289c_0.csv
issued: 2022-06-23T00:49:38.029864
modified: 2025-11-22T06:48:35.945883

KML
type: Distribution
media type: application/vnd.google-earth.kml+xml
format: KML
access URL: https://gis.data.cnra.ca.gov/datasets/02ff4971b8084ca593309036fb72289c_0.kml
issued: 2022-06-23T00:49:38.029866
modified: 2025-11-22T06:48:35.946312

Shapefile
type: Distribution
media type: application/zip
format: ZIP
access URL: https://gis.data.cnra.ca.gov/datasets/02ff4971b8084ca593309036fb72289c_0.zip
issued: 2022-06-23T00:49:38.029869
modified: 2025-11-22T06:48:35.946747