California region, with its 10 4-digit subregion hydrologic unit boundaries

The California water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey in the United States hydrologic unit system, which is used to divide and sub-divide the United States into successively smaller hydrologic units. These geographic areas contain either the drainage area of a major river, or the combined drainage areas of a series of rivers.[1][2]

The California region, which is listed with a 2-digit hydrologic unit code (HUC) of 18, has an approximate size of 168,579 square miles (436,620 square kilometers), and consists of 10 subregions, which are listed with the 4-digit HUCs 1801 through 1810.[3]

This region includes the drainage within the United States that ultimately discharges into the Pacific Ocean within the state of California; and those parts of the Great Basin (or other closed basins) that discharge into the state of California. Includes parts of California, Nevada, and Oregon.[3]

List of California water resource subregions

Subregion HUC[4] Subregion Name[4] Subregion Description[3] Subregion Location[4] Subregion Size[4] Subregion Map
1801 Klamath–Northern California Coastal subregionThe drainage into the Pacific Ocean from and including the Smith River Basin to and including the Stemple Creek BasinCalifornia, Oregon24,800 sq mi (64,000 km2)
HUC1801
HUC1801
1802 Sacramento subregionThe Sacramento River Basin and drainage into Goose LakeCalifornia, Oregon27,600 sq mi (71,000 km2)
HUC1802
HUC1802
1803 Tulare–Buena Vista Lakes subregionThe drainage into the Tulare and Buena Vista Lake closed basinsCalifornia16,200 sq mi (42,000 km2)
HUC1803
HUC1803
1804 San Joaquin subregionSan Joaquin River BasinCalifornia15,600 sq mi (40,000 km2)
HUC1804
HUC1804
1805 San Francisco Bay subregionThe drainage into the Pacific Ocean from the Stemple Creek Basin boundary to and including the Pescadero Creek Basin, excluding the Sacramento and San Joaquin River BasinsCalifornia4,470 sq mi (11,600 km2)
HUC1805
HUC1805
1806 Central California Coastal subregionThe drainage into the Pacific Ocean from the Pescadero Creek Basin boundary to and including the Rincon Creek BasinCalifornia11,400 sq mi (30,000 km2)
HUC1806
HUC1806
1807 Southern California Coastal subregionDrainage within the United States that discharges into the Pacific Ocean from the Rincon Creek Basin boundary to the California-Baja California international boundaryCalifornia11,100 sq mi (29,000 km2)
HUC1807
HUC1807
1808 North Lahontan subregionThe drainage east of the Sierra Nevada and north of the Truckee River Basin, which includes the Lahonton closed basins that discharge into CaliforniaCalifornia, Nevada4,480 sq mi (11,600 km2)
HUC1808
HUC1808
1809 Northern Mojave–Mono Lake subregionThe Closed Desert Basins that discharge into South Central California, including Mono Lake, Owens Lake, Death Valley, and the Upper Mojave DesertCalifornia, Nevada28,000 sq mi (73,000 km2)
HUC1809
HUC1809
1810 Southern Mojave–Salton Sea subregionThe closed desert basins in southeastern California, including the Lower Mojave Desert and the Salton SeaCalifornia16,000 sq mi (41,000 km2)
HUC1810
HUC1810

Additional images

See also

References

  1. "Science in Your Watershed - Locate Your Watershed". USGS. Retrieved 2016-10-12.Public Domain This article incorporates text from this source, which is in the public domain.
  2. "Hydrologic Unit Maps". USGS. Retrieved 2016-10-12. Public Domain This article incorporates text from this source, which is in the public domain.
  3. 1 2 3 "Boundary Descriptions and Names of Regions, Subregions, Accounting Units and Cataloging Units". water.usgs.gov. USGS. Retrieved 2016-10-12. Public Domain This article incorporates text from this source, which is in the public domain.
  4. 1 2 3 4 McManamay RA, Bevelhimer MS, Kao SC, Yaxing W, Martinez-Gonzalez M, Samu N (2013). "National Hydropower Asset Assessment Environmental Attribution". USGS-Oak Ridge National Laboratory. Retrieved 2016-10-12. Public Domain This article incorporates text from this source, which is in the public domain.
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