Farm to Market Road 170

Farm to Market Road 170
Route information
Maintained by TxDOT
Length	114.580 mi[1] (184.399 km)
Existed	June 11, 1945–present
Major junctions
West end	Chispa Road in Candelaria
Major intersections	US 67 in Presidio Spur 203 in Presido
East end	SH 118 in Study Butte
Location
Country	United States
State	Texas
Counties	Presidio, Brewster
Highway system
Highways in Texas Interstate US State Toll Loops Spurs FM/RM Park Rec
← RM 169 → FM 171

Farm to Market Road 170 (FM 170) is a 114.6-mile (184.4 km) highway maintained by the Texas Department of Transportation (TxDOT) in Presidio and Brewster counties in Texas, United States. The route, known locally as the River Road, runs along the United States side of the Rio Grande which in Texas forms the international boundary between the U.S. and Mexico. The road runs from Candelaria through the city of Presidio as well as several smaller communities and former settlements to State Highway 118 in Study Butte near Big Bend National Park. The road also passes through the southern portion of Big Bend Ranch State Park.

The highway was first designated in 1945 and over the years was gradually extended outward from Presidio. Eastern portions of the road in Brewster County, however, had several previous highway designations going back to 1939.

In addition to SH 118 in Study Butte, FM 170 has highway intersections in Presidio with U.S. Route 67 and its auxiliary route Business U.S. Route 67-A along with State Highway Spur 203.