The entire stretch of road runs in the Gila River Indian Reservation and is approximately 5 miles (8.0 km) long.

It is a short-cut for traffic heading toward the southeast valley of Phoenix in case of an accident on westbound Interstate 10.

SR 187 heads northeast from this junction to an intersection with the Casa Grande Highway.

It continues towards the northeast to its northern terminus at an intersection with SR 87.

[3] The entire route is in Gila River Indian Community, Pinal County.