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<br />Table l.--Codes and names for hydrologic subregions <br /> <br />Subregion <br />code <br /> <br />Subregion <br />name <br /> <br />REGION 10--MISSOURI REGION <br /> <br />1018 <br />1019 <br />1025 <br />1026 <br /> <br />North Platte <br />South Platte <br />Republican <br />Smoky Hill <br /> <br />REGION 11--ARKANSAS-WHITE-RED REGION <br /> <br />1102 <br />1103 <br />1104 <br />1108 <br /> <br />Upper Arkansas <br />Middle Arkansas <br />Upper Cimarron <br />Upper Canadian <br /> <br />REGION 13--RIO GRANDE REGION <br /> <br />1301 <br />1302 <br /> <br />Rio Grande Headwaters <br />Rio Grande-Elephant Butte <br /> <br />REGION 14--UPPER COLORADO REGION <br /> <br />1401 <br />1402 <br />1403 <br />1404 <br />1405 <br />1406 <br />1408 <br /> <br />Colorado Headwaters <br />Gunnison <br />Upper Colorado-Dolores <br />Great Divide-Upper Green <br />White-Yampa <br />Lower Green <br />San Juan <br /> <br />4 <br />