California water resource region

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California region, with its 10 4-digit subregion hydrologic unit boundaries HUC18.jpg
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]

Contents

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 subregion The drainage into the Pacific Ocean from and including the Smith River Basin to and including the Stemple Creek Basin California, Oregon 24,800 sq mi (64,000 km2)
HUC1801 HUC1801.jpg
HUC1801
1802 Sacramento subregion The Sacramento River Basin and drainage into Goose Lake California, Oregon27,600 sq mi (71,000 km2)
HUC1802 HUC1802.jpg
HUC1802
1803 Tulare–Buena Vista Lakes subregion The drainage into the Tulare and Buena Vista Lake closed basinsCalifornia16,200 sq mi (42,000 km2)
HUC1803 HUC1803.jpg
HUC1803
1804 San Joaquin subregion San Joaquin River Basin California15,600 sq mi (40,000 km2)
HUC1804 HUC1804.jpg
HUC1804
1805 San Francisco Bay subregion The 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.jpg
HUC1805
1806 Central California Coastal subregion The drainage into the Pacific Ocean from the Pescadero Creek Basin boundary to and including the Rincon Creek Basin California11,400 sq mi (30,000 km2)
HUC1806 HUC1806.jpg
HUC1806
1807 Southern California Coastal subregion Drainage within the United States that discharges into the Pacific Ocean from the Rincon Creek Basin boundary to the California-Baja California international boundary California11,100 sq mi (29,000 km2)
HUC1807 HUC1807.jpg
HUC1807
1808 North Lahontan subregion The drainage east of the Sierra Nevada and north of the Truckee River Basin, which includes the Lahonton closed basins that discharge into CaliforniaCalifornia, Nevada 4,480 sq mi (11,600 km2)
HUC1808 HUC1808.jpg
HUC1808
1809 Northern Mojave–Mono Lake subregion The Closed Desert Basins that discharge into South Central California, including Mono Lake, Owens Lake, Death Valley, and the Upper Mojave Desert California, Nevada28,000 sq mi (73,000 km2)
HUC1809 HUC1809.jpg
HUC1809
1810 Southern Mojave–Salton Sea subregion The closed desert basins in southeastern California, including the Lower Mojave Desert and the Salton Sea California16,000 sq mi (41,000 km2)
HUC1810 HUC1810.jpg
HUC1810

Additional images

See also

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References

  1. ↑ "Science in Your Watershed - Locate Your Watershed". USGS . Retrieved 2016-10-12.PD-icon.svg This article incorporates text from this source, which is in the public domain .
  2. ↑ "Hydrologic Unit Maps". USGS . Retrieved 2016-10-12.PD-icon.svg 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.PD-icon.svg 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.PD-icon.svg This article incorporates text from this source, which is in the public domain .
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