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This is a list of rivers in the United States that have names starting with the letter U. For the main page, which includes links to listings by state, see List of rivers in the United States.

U Ugashik River - Alaska Umatilla River - Oregon Umpachene River - Massachusetts Umpqua River - Oregon Unadilla River - New York Unalakleet River - Alaska Uncompahgre River - Colorado Union River - Maine Unuk River - Alaska Upper Ammonoosuc River - New Hampshire Upper Iowa River - Minnesota, Iowa Upper Tamarack River - Wisconsin, Minnesota Us-kab-wan-ka River - Minnesota Usquepaug River - Rhode Island Utukok River - Alaska Uwharrie River - North Carolina