Clark Fork River Trail #223 features 9 miles of hiking trails near St Regis, MT.
From I-90 northwest of Missoula exit at highway #135 at St. Regis and before reaching Paradise parking lot and trail head on the west side of the highway by the 14 Mile Bridge. Trail is 9 miles each way. Trail starts under train tressel.
http://www.tripleblaze.com/trail.php?c=3&i=1096