Skip to main content
U.S. flag

An official website of the United States government

Hydrological Unit: HUC2

HUC Name
01 New England Region
02 Mid Atlantic Region
03 South Atlantic-Gulf Region
04 Great Lakes Region
05 Ohio Region
06 Tennessee Region
07 Upper Mississippi Region
08 Lower Mississippi Region
09 Souris-Red-Rainy Region
10 Missouri Region
11 Arkansas-White-Red Region
12 Texas-Gulf Region
13 Rio Grande Region
14 Upper Colorado Region
15 Lower Colorado Region
16 Great Basin Region
17 Pacific Northwest Region
18 California Region
19 Alaska Region
20 Hawaii Region
21 Caribbean Region