U.S. Route 85 (US 85) is a north–south United States Highway that travels in the Mountain and Northern Plains states of the United States. The southern terminus of the highway is at the Mexican border in El Paso, Texas, connecting with Mexican Federal Highway 45. The northern terminus is at the Canadian border in Fortuna, North Dakota, where the route continues north as Saskatchewan Highway 35. The highway route is part of the CanAm Highway. Sections of US 85 are designated as the Theodore Roosevelt Expressway. Route description |- |TX |21 |34 |- |NM |483 |777 |- |CO |310 |499 |- |WY |256 |412 |- |SD |154 |248 |- |ND |255 |410 |- |Total |1479 |2380 |} The highway passes through Texas, New Mexico, Colorado, Wyoming, South Dakota, and North Dakota. From Las Cruces, New Mexico to Fountain, Colorado, US-85 shares its alignment with I-25 and is not signed. Texas US 85 in Texas begins at the Mexico–US border with US 62 and travels north through El Paso, beginning at the Santa Fe Street Bridge, and following Santa Fe Street, then Paisano Drive westward, along the Rio Grande until Paisano Drive ends where it joins with Interstate 10, about before both reach the New Mexico border. The route is concurrent with I-10 for the remainder of its route within Texas. The original route of US 85 in Texas had the highway concurrent with Doniphan Drive (after Paisano Drive), and parallelling the Atchison, Topeka and Santa Fe Railway through the Mesilla Valley communities of Canutillo, Vinton and Anthony before crossing the Texas/New Mexico state line in Anthony, New Mexico, then following the road which is now New Mexico State Road 478 (NM 478) up the Mesilla Valley to Las Cruces. This route is marked as Texas State Highway 20 north of the intersection with Mesa Street/Country Club Drive. New Mexico The unsigned route of US 85 through New Mexico exists only on paper to maintain continuity with signed sections in Colorado and Texas. Except for a 4-mile segment through Las Vegas (signed as Business Loop 25), US 85 in New Mexico is entirely concurrent with Interstate Routes. For the first it shares its route with I-10, then continues north for the remainder of its length in New Mexico concurrent with I-25. US-85 was de-signed in segments between 1970 and 1990 as I-25 was built through the state. I-25 between Bernalillo and