 From Buttermilk, K-1 continues north until it reaches it northern terminus at an intersection with US‑160/US‑183, south of Coldwater.US‑160/US‑183 continues north to Coldwater and west to Protection.The entire route of K-1 is paved with partial design bituminous pavement, a type of bituminous pavement which is not designed or constructed to carry the highway's expected traffic.