Nevada State Route 291

State Route 140
Denio Road; Adel/Oregon Road
Nevada State Route 140, highlighted in red.
Route information
Maintained by NDOT
Length:	110.113 mi (177.210 km)
Existed:	by 1968 – present
Major junctions
Southeast end:	US 95 north of Winnemucca
Northwest end:	OR 140 at the Oregon state line
Location
Counties:	Humboldt
Highway system
Highways in Nevada Interstate U.S. State pre-1976 Scenic ← SR 121 SR 144 →

State Route 140 (SR 140) is a two-lane state highway in Humboldt County, Nevada. It serves a sparsely populated section of the state, connecting northwestern Nevada to southern Oregon. Most of the highway was originally part of State Route 8A, and was later improved through an effort to provide an all-weather highway linking northern Nevada to the Pacific Northwest.

State Route 140 begins at a junction with U.S. Route 95 about 32 miles (51 km) north of Winnemucca in the Quinn River Valley. From this point, the highway heads west towards the sparsely populated regions of northwestern Nevada. SR 140 crosses into the Desert Valley before entering a branch of the Fort McDermitt Indian Reservation. Inside the reservation, the route crosses the Quinn River. Upon exiting the Indian territory, SR 140 curves northwest to parallel the Quinn River for about 10 miles (16 km) as it rounds the northern edge of the Jackson Mountains. As the river turns southeast towards the Black Rock Desert, the highway continues its northwest trajectory through the valley between the Bilk Creek Mountains on the east and the Pine Forest Range to the west. The route crosses over the 4,820-foot (1,470 m) Denio Summit before reaching Denio Junction. State Route 292 intersects the highway here, providing access to Denio, the only town in this region of Nevada.