The HUC2 Codes
2-digit Hydrological Unit Codes represent the largest aggregation of watersheds known as hydrologic regions.


Sequential List


01='NEW ENGLAND'
02='MID ATLANTIC'
03='SOUTH ATLANTIC-GULF'
04='GREAT LAKES'
05='OHIO'
06='TENNESSEE'
07='UPPER MISSISSIPPI'
08='LOWER MISSISSIPPI'
09='SOURIS-RED-RAINY'
10='MISSOURI'
11='ARKANSAS-WHITE-RED'
12='TEXAS-GULF'
13='RIO GRANDE'
14='UPPER COLORADO'
15='LOWER COLORADO'
16='GREAT BASIN'
17='PACIFIC NORTHWEST'
18='CALIFORNIA'
19='ALASKA'
20='HAWAII'
21='CARIBBEAN'


Last Update: 02-04-97