Colorado's Unit 231 is bounded on N by Routt CRs 29, 132A, 25, 132 & 15; on E by Colo. 131; on S by Bear River; on W by Williams Fork-Yampa River divide to Dunkley Pass, Rio Blanco CRs 8 & 19 and Routt CR 55. 301 - (MOFFAT CO.) bounded on N by CRs 5, 158, 3 & 108; on E by Colo. 13/789; on S by Yampa River; on W by CR 17.
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