Prior to the construction of Copan Dam west of town, US-75 and OK-10 came through downtown Copan. US-75 entered Washington County from High Street in nearby Caney Kansas. As the old Highway 75 came south, it entered the town on Caney Street. As it exited south of town, it rejoined the current alignment at Washington County Road N 3975 Rd. OK-10 came out of the town of Wann Oklahoma in northern Nowata County Oklahoma, entered the town at Golden Avenue, then came south on Caney Street (old U-75) for 0.3 miles, then continued west on Weldon Avenue. There were two 90 degree curves on the town's west side, the first took the highway south for 0.1 miles, the second took the highway back toward the west and had it concurrency with Washington County W. 850 Rd and intersected Washington County N. 3970 Rd, and crossed the Little Caney River, and rejoined the current alignment of OK-10 west of the now Copan Lake into Osage County Oklahoma.