Description
Extends SE from Marias Pass along the Continental Divide to Little Prickly Pear Creek, 32 km (20 mi) NW of Helena; bounded on the W by the Flathead and Swan Ranges and on the E by the Sawtooth Range; [NW end] coordinates , 481900N1132100W ; [SE end] coordinates , 465000N1121300W. (US-T121)