# Wyoming Highway 789

Wyoming Highway 789 (WYO 789) is a 407-mile-long (655 km) state highway in the U.S. state of Wyoming. WYO 789 travels south-to-north from the Colorado state line to the Montana state line. For most of its length, it is concurrent with other routes. It was the path of a formerly-proposed U.S. Route 789 that was canceled.

## Route description

WYO 789 begins at the Colorado state line just south of Baggs. It travels north for about 4 miles (6.4 km) to Baggs. After Baggs, it continues north for about 45 miles (72 km) until it reaches the county line.
After crossing the county line, WYO 789 travels north for about 6 miles (9.7 km) where it reaches exit 187 of I-80/US 30. WYO 789 joins I-80/US 30 eastbound.
I-80/US 30/WYO 789 re-enter Carbon County. Just west of Rawlins, WYO 789 leaves at exit 211, joining I-80 Bus./US 30 Bus. through Rawlins. North of town, WYO 789 intersects US 287 and travels concurrent with it north for 50 miles (80 km) to the county line, after which it passes through Natrona County for about 2 miles (3.2 km).
US 287/WYO 789 continue in a northwest direction, passing through the towns of Jeffrey City and Sweetwater Station. About 40 miles (64 km) from Sweetwater Station, US 287/WYO 789 enter Lander. WYO 789 splits from US 287 here and continues northeast for 24 miles (39 km), alone, to Riverton. WYO 789 joins US 26 until they reach Shoshoni. Here, US 26/WYO 789 intersect US 20 where WYO 789 continues north with US 20 west.
US 20/WYO 789 continue through the Wind River Canyon into Thermopolis. From there, the highway veers off in a northeasterly direction into Washakie County. From the Washakie county line, the highway travels approximately 21 miles (34 km) before crossing the Big Horn River into Worland where it joins US 16/US 20.
Upon crossing into Big Horn County, US 16/US 20/WYO 789 veer back to the northwest and cross back over the Big Horn River after reaching Manderson. It continues on 20 miles (32 km) to the north through Basin and Greybull. Upon reaching Greybull, US 16/US 20/WYO 789 head west and join US 14 for about 5 miles (8.0 km).
At that point, WYO 789 separates from the concurrency of US 14/US 16/US 20 and returns to its northern path along with US 310 for about 28 miles (45 km) to the town of Lovell. For about 3 miles (4.8 km), US 310/WYO 789 travels west along US 14 Alt. US 310/WYO 789 then turn north for about 3 miles (4.8 km) to Cowley and then head west about 7 miles (11 km) to Deaver.
From Deaver, US 310/WYO 789 travel about 6 miles (9.7 km) north to Frannie, where they straddle the boundary between Big Horn County and Park County. Just to the north of Frannie, US 310/WYO 789 bends slightly to the west, so that the road is actually inside Park County by about 400 feet before reaching the Montana state line. At the state line, WYO 789 ends, while US 310 continues north.

## History

WYO 789 was part of a 1950s proposal for a border-to-border U.S. Route 789 that would have traveled from Nogales, Arizona, to Sweet Grass, Montana. After the US 789 proposal was rejected by AASHTO on 14 October 1952, US 789 became part of a series of state highways numbered 789 traveling along the proposed route. Wyoming, however, was the only state that actually applied the number exclusively to existing highways (but only in some sections), whereas the other states simply added a concurrent SR 789 over existing highways. Because of this, all the states except Wyoming eventually deleted the designation and removed the signs.

## Major intersections

| County | Location | mi | km | Destinations | Notes |
| Carbon | ​ | 0.00 | 0.00 | SH 13 south – Craig, Meeker, Rifle | Continuation beyond Colorado state line |
| Carbon | Baggs | 2.52 | 4.06 | WYO 70 – Dixon | Western terminus of WYO 70 |
| Sweetwater | ​ | 53.19 | 85.60 | I-80 west / US 30 west – Rock Springs | Western end of I-80/US 30 concurrency; Exit 187 on I-80 |
| Carbon | ​ | 77.77 | 125.16 | I-80 east / US 30 east / I-80 BL ends / US 30 Bus. ends – Cheyenne | Eastern end of I-80/US 30 concurrency; western end of I-80 Bus./US 30 Bus. concurrency; I-80/US 30, exit 211 |
| Carbon | Rawlins | 79.41 | 127.80 | US 287 south / I-80 BL east / US 30 Bus. east – Laramie | Eastern end of I-80 Bus./US 30 Bus. concurrency; southern end of US 287 concurrency |
| Carbon | ​ | 81.13 | 130.57 | US 287 Byp. | Northern terminus of US 287 Bypass; southern end of Chief Washakie Trail |
| Carbon | ​ | 112.47 | 181.00 | WYO 73 – Bairoil | Eastern terminus of WYO 73 |
| Carbon | ​ | 123.52 | 198.79 | WYO 220 / California National Historic Trail / Mormon Pioneer National Historic Trail / Oregon National Historic Trail / Pony Express National Historic Trail – Casper | Western terminus of WYO 220 |
| Natrona | No major junctions | No major junctions | No major junctions | No major junctions | No major junctions |
| Fremont | ​ | 165.63 | 266.56 | WYO 135 – Riverton | Southern terminus of WYO 135 |
| Fremont | ​ | 195.82 | 315.14 | WYO 28 / California National Historic Trail / Mormon Pioneer National Historic Trail / Oregon National Historic Trail / Pony Express National Historic Trail – Rock Springs | Eastern terminus of WYO 28 |
| Fremont | Lander | 204.00 | 328.31 | US 287 north / Chief Washakie Trail north – Dubois, Teton, Yellowstone, Sinks Canyon State Park | Northern end of US 287 concurrency |
| Fremont | ​ | 215.59 | 346.96 | Ethete Road – Arapahoe | Former WYO 138 |
| Fremont | Arapahoe | 227.02 | 365.35 | Ethete Road / Sand Creek Massacre Trail west – Arapahoe | Former WYO 137 |
| Fremont | Arapahoe | 227.38 | 365.93 | WYO 135 to WYO 136 (Gas Hills Road) – Rawlins, Castle Gardens | Northern terminus of WYO 135 |
| Fremont | Riverton | 228.73 | 368.11 | US 26 west (Main Street) – Dubois, Yellowstone, Teton | Southern end of US 26 concurrency |
| Fremont | ​ | 242.61 | 390.44 | WYO 134 – Pavillion | Eastern terminus of WYO 134 |
| Fremont | Shoshoni | 250.87 | 403.74 | US 20 east / US 26 east (2nd Street east) / Sand Creek Massacre Trail east – Casper | Northern end of US 26 concurrency; southern end of US 20 concurency |
| Hot Springs | ​ | 280.62 | 451.61 | WYO 173 (Buffalo Creek Road) | Western terminus of WYO 173 |
| Hot Springs | Thermopolis | 283.27 | 455.88 | WYO 120 – Meeteetse, Cody, Wyoming Dinosaur Center | Southern terminus of WYO 120; access to Hot Springs Memorial Hospital |
| Hot Springs | Lucerne | 290.55 | 467.59 | WYO 172 (Black Mountain Road) | Western terminus of WYO 172 |
| Hot Springs | Kirby | 294.95 | 474.68 | WYO 175 – Kirby | Western terminus of WYO 175 |
| Washakie | ​ | 307.28 | 494.52 | WYO 431 west / WYO 432 east | Eastern terminus of WYO 431; southern terminus of WYO 432 |
| Washakie | ​ | 315.35 | 507.51 | WYO 433 | Southern terminus of WYO 433 |
| Washakie | Worland | 316.01 | 508.57 | To WYO 432 | |
| Washakie | Worland | 316.33 | 509.08 | US 16 east – Buffalo | Southern end of US 16 concurrency; access to Washakie Medical Center |
| Big Horn | Manderson | 334.98 | 539.10 | WYO 31 – Manderson, Hyattville | Western terminus of WYO 31 |
| Big Horn | ​ | 336.15 | 540.98 | WYO 433 | Northern terminus of WYO 433 |
| Big Horn | Basin | 346.60 | 557.80 | WYO 30 – Burlington | Eastern terminus of WYO 30 |
| Big Horn | ​ | 349.45 | 562.39 | WYO 36 (Golf Course Road) | Northern terminus of WYO 36 |
| Big Horn | Greybull | 354.23 | 570.08 | US 14 east (Greybull Avenue) – Shell, Sheridan | Southern end of US 14 concurrency |
| Big Horn | ​ | 359.21 | 578.09 | US 14 / US 16 / US 20 west / US 310 begins – Cody, Yellowstone | Eastern terminus of US 310; northern end of US 14, US 16, and US 20 concurrencies; southern end of US 310 concurrency |
| Big Horn | Lovell | 386.24 | 621.59 | US 14A east – Burgess Junction | Southern end of US 14A concurrency |
| Big Horn | ​ | 387.98 | 624.39 | WYO 32 – Emblem | Northern terminus of WYO 32 |
| Big Horn | ​ | 389.44 | 626.74 | US 14A west – Byron, Powell, Cody | Northern end of US 14A concurrency |
| Big Horn | Cowley | 393.34 | 633.02 | WYO 35 | Northern terminus of WYO 35 |
| Big Horn | Deaver | 399.35 | 642.69 | WYO 114 – Garland, Powell, Cody | Eastern terminus of WYO 114 |
| Park | ​ | 407.14 | 655.23 | US 310 east – Bridger, Billings | Continuation into Montana; northern end of US 310 concurrency |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus ||||||