AMP: 87 Location: US-87 and Highwood Rd, Cascade Cty Reassurance shield after the 227/228 junction. AMP: 74 Location: US-87 and S-331, Cascade Cty A few miles later, we’ll approach Secondary 331. AMP: 74 Location: US-89 and S-331, Cascade Cty Turn left for S-331, which heads north.       S to US-87/MT-3/MT-200, N to US-87  S to US-89, N to … Continue reading U.S. Route 89, S-227/S-228 to S-331