Business Loop I-70 - Colby

Former Business Route

Business Loop I-70/K-25 north of College Drive in Colby, KS — Reassurance markers for Business Loop I-70 west / K-25 north after College Drive on Range Avenue north in Colby, Kansas. The I-70 shield was removed by 2009. Photo by Brian O'Neill (12/29/03).

Traveling 11.3 miles, Business Loop I-70 overlapped with U.S. 24 east from Exit 45 near Levant to K-25 in Colby and south on K-25 back to I-70 at Exit 53. The route was submitted to AASHTO in 1979 and subsequently disapproved on October 13.

Brian O’Neill reported that the route was signed nonetheless as it ran north along Range Avenue (K-25) to the city’s old high school and west along 4th Street (U.S. 24). A remaining shield was still posted on K-25 southbound by Thomas County Speedway in 2007.

Updated August 1, 2026