The southern terminus of SR 257 is at its intersection with SR 195 northeast of Jasper. From this point, the route takes a northeasterly course as two-lane undivided Curry Highway, passing through wooded areas with some homes.
SR 257's southernmost point is found at its intersection with SR 195 near Jasper. The road then proceeds north-northeast along a two-lane highway that winds through woodland areas and encounters private homes.