| State: | CO |
| Type: | CO |
| Route: | 57 |
| Alternate Name: | Colorado Avenue |
| Map Custom: | yes |
| Length Mi: | 0.534 |
| Length Round: | 3 |
| Length Ref: | [1] |
| Established: | 1920s |
| Direction A: | South |
| Direction B: | North |
| Terminus B: | in Stratton |
| Previous Type: | CO |
| Previous Route: | 56 |
| Next Type: | CO |
| Next Route: | 58 |
State Highway 57 (SH 57) is a short, 0.534miles state highway in Kit Carson County, Colorado, United States, that connects Interstate 70 (I‑70), south of Stratton with U.S. Route 24 (US 24) in Stratton.
SH 57 begins at a diamond interchange with I‑70 (I‑70 Exit 419) just south of Stratton.[1] I‑70 heads west toward Vona, Limon, and Denver and east toward Bethune, Burlington, and eventually, Hays, Kansas. County Road 30.5 heads very briefly south before ending shortly after a connection with the north end of County Road 31 [CR 31]--the former routing of SR 57.) From its southern terminus, SH 57 heads northward for about 0.2miles before the city limits of Stratton. SH 57 quickly crosses Claremont Street/Seventh Street, followed by Sixth and Fifth streets, before reaching an intersection with US 24 (Fourth Street), its northern terminus. (US 24 heads east toward Bethune and Burlington and west toward Vona, Seibert, and Limon. Colorado Avenue continues north to CR 30.5.)[2]
The route is entirely unsigned; there are no signs designating the route as SH 57.[3] However, the Colorado Department of Transportation (CDOT) still recognizes it as a state highway and maintains it as needed.
As of 2021, approximately 2000 cars used the route daily.[4]
The route was established in the 1920s. At the time of its establishment, the route was far longer than it is today, extending nearly 25miles. It began at US 24 in Stratton and headed north to Kirk and on to U.S. Route 36. In 1939, SH 57 was extended south for 8miles; however, most of this extension was removed in 1954, leaving only around Stratton. This entire remaining length was paved by 1956. The highway was linked to I‑70 in 1966 when the Interstate Highway System was built, and the 8miles stretch north of US 24 was removed from the numbered route in 1992, leaving the approximately NaNadj=onNaNadj=on routing seen today.[3]