Colorado State Highway 257
State Highway 257 (SH 257) is an state highway in Colorado's Front Range. It is located entirely in Weld County. SH 257's western terminus is at SH 60 in Milliken, and the eastern end is at SH 14 north of Windsor. Route description. The route begins at SH 60 in the western part of Milliken, a town in central Weld County. It then heads northward, crosses the Big Thompson River, a tributary of the South Platte River then enters Greeley. At Greeley, SH 257 has two interchanges with US 34 and U.S. Route 34  Business (US 34 Bus.). Because the intersection is so close to the terminus of US 34 Bus., the two interchanges are just 0.3 miles apart. Both are diamond interchanges, but at US 34 there are only entrance ramps from the east side. It then heads northward, and begins to curve northwest over the Cache la Poudre River and into Windsor. It intersects SH 392 and abruptly turns west, beginning a concurrency at Main Street; about a mile later SH 257 abruptly turns back northward at 7th Street, ending the concurrency. It then heads all the way north to SH 14 , where it terminates. No towns exist on the route from Windsor to SH 14. History. The route was established in 1939 with several differences. The route went north to Windsor from Milliken, then turning west to SH 185. SH 185 was then deleted and replaced with Interstate 25, and SH 257 was readjusted so that it went north to SH 14. The route was paved by 1954. A spur south of Windsor was eliminated a year later. The interchanges at US 34 and BR 34 were built in 1998. In November 2009, a new traffic signal was installed at the  intersection with Garden Drive in Windsor. The construction cost about $350,000. Future. Because of congestion around the US 34 and BR 34 interchanges, a bus rapid transit system has been planned to be built in Greeley.