Watersheds of Utah

Document Type

Contribution to Book

Journal/Book Title/Conference

Rangeland Resources of Utah

Publisher

Utah State University

Publication Date

1-1-2009

First Page

29

Last Page

38

Abstract

The USDA Natural Resources Conservation Service (NRCS) and the United States Geological Survey (USGS), as part of a national effort, have generated watershed, or hydrologic, boundaries for the United States. Hydrologic boundaries define the aerial extent of surface water drainage to a point. Hydrologic units, through four levels, were created in the 1970s. Since the 1970s, the USGS developed a hierarchical hydrologic unit code (HUC) for the United States. The hierarchical system divides the country into 21 regions, 222 sub-regions, 352 basins, and 2,149 sub-basins. During the late 1970s, the NRCS initiated a national program to divide the sub-basins into watersheds and sub-watersheds (NRCS, 2009a). Consequently, regions are the largest level, and within regions, there are sub-regions, basins, sub-basins, watersheds, and sub-watersheds.

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