Alaska Region
190104
Southeast Alaska
Gulf of Alaska
Yakutat Bay. Alaska.
19010401
Souris-Red-Rainy Region
090300
Rainy
Lake of the Woods. Minnesota.
9030009
Pacific Northwest Region
171100
Puget Sound
Straight of Georgia. Washington.
17110002
Missouri Region
100500
Milk
Whitewater. Montana.
10050011
Great Lakes Region
040203
Southern Lake Superior-Lake Superior
Lake Superior
Lake Superior. Michigan, Minnesota, Wisconsin.
4020300
Upper Mississippi Region
070101
Mississippi Headwaters
Mississippi Headwaters. Minnesota.
7010101
New England Region
010100
St. John
Upper St. John. Maine
1010001
Mid Atlantic Region
020100
Richelieu
Missiquoi. Vermont.
2010007
Upper Colorado Region
140401
Great Divide-Upper Green
Upper Green
Upper Green. Wyoming.
14040101
California Region
180102
Klamath-Northern California Coastal
Klamath
Willamson. Oregon.
18010201
Great Basin Region
160102
Bear
Lower Bear
Bear Lake. Idaho, Utah.
16010201
Ohio Region
050100
Allegheny
Conewango. Pennsylvania, New York.
5010002
Arkansas-White-Red Region
110200
Upper Arkansas
Arkansas Headwaters. Colorado.
11020001
Lower Colorado Region
150100
Lower Colorado-Lake Mead
White. Nevada.
15010011
Rio Grande Region
130100
Rio Grande Headwaters
San Luis. Colorado.
13010003
Lower Mississippi Region
080202
Lower Mississippi-St. Francis
St. Francis
Upper St. Francis. Missouri.
8020202
0
South Atlantic-Gulf Region
030101
Chowan-Roanoke
Roanoke
Upper Roanoke. Virginia.
3010101
Tennessee Region
060102
Upper Tennessee
Upper Clinch, Tennessee, Virginia.
6010205
Texas-Gulf Region
120500
Brazos Headwaters
Running Water Draw. New Mexico, Texas.
12050005
Hawaii Region
200700
Kauai
Kauai. Hawaii.
20070000
Caribbean Region
210100
Puerto Rico
Cibuco-Guajataca. Puerto Rico
21010002