AMP: 10 Location: S-331 and S-228, Cascade Cty Reassurance shield as Secondary 331 begins. AMP: 1 Location: Castner St and Bridge St, Belt A few miles later, we’ll approach downtown Belt, which is incorporated. In Belt, fork right to head through downtown and then continue to US-87. AMP: 0 Location: S-331 and US-87, Cascade Cty A mile and … Continue reading Montana Secondary Highway 331, S-228 to US-87/US-89/MT-3/MT-200