AMP: 49 Location: Tiber Dam Rd and S-223, Liberty Cty No reassurance shield as S-366 begins. 366 is unpaved for its first 21 miles through the Tiber Dam area. AMP: 42 Location: Tiber Dam Rd and Park Rd, Liberty Cty A few miles later, keep right for S-366. The fork to the left heads to a park … Continue reading Montana Secondary Highway 366, S-223 to S-225