A river runs through it

We'll give you three U.S. cities on the same river. You name the river.

ClueRightWrongClamUngraded
(2/-1) Pittsburgh (PA), Louisville (KY), Evansville (IN)6918
(4/-2) Harpers Ferry (WV), Cumberland (MD), Alexandria (VA)68010
(6/-3) Alamosa (CO), Albuquerque (NM), McAllen (TX)56517
(8/-4) Cooperstown (NY), Williamsport (PA), Havre de Grace (MD)261141
(10/-5) Blackfoot (ID), Twin Falls (ID), Pasco (WA)54420

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