Location: SH-66 and Main St, Platteville Almost immediately after turning from US-85, 85 business will leave SH-66 and head north through Platteville N to US-85 W to I-25/US-87   E to US-85/US-85 Bus, W to I-25/US-87 N to US-85 Bus, S to US-85 Bus W to US-85 Bus