[2] No segment of SR 285 is included within the National Highway System.

[4][5] Within one year, the route was extended north via a dirt road to US 40 in Old Washington.

[6] By 1935, the route was extended to its current northern terminus at US 22.

[7] SR 285 was extended to its current southern terminus in Caldwell (at the time, US 21) by 1937.

[8] No major changes have occurred to the route since that time.