Drives Wyoming Laramie, Lander and Southern Wyoming
Wind River Canyon: US-20
US 20, WY 789 · Shoshoni → Thermopolis
The drive
US 20 runs north from Shoshoni, past Boysen Reservoir, and down into Wind River Canyon on the way to Thermopolis. The canyon walls rise roughly 2,500 feet, and the highway runs through short tunnels along the river.
The canyon's north end is the Wedding of the Waters, where the Wind River becomes the Bighorn River. Early explorers thought they were two different rivers. The drive ends in Thermopolis, home of Hot Springs State Park.
The 20-mile canyon section was built in 1924, at a cost of $1 million, then the most expensive stretch of highway in the country. It is 31 miles and about 30 minutes, with mostly gentle curves.
Along the way
- Shoshoni
- Wedding of the Waters
- Thermopolis
Good to know
- The tunnels limit overheight vehicles to 18 feet and overwide vehicles to 24 feet, per WYDOT.
- WYDOT lists a falling rock advisory on US 20 between Thermopolis and Boysen Dam.
- Near Shoshoni, WYDOT lists a 12 foot width restriction while traffic detours for a railroad crossing replacement.
Open all year, weather permitting. Roads close for snow, fire, storms and repairs: before you set off, check WYDOT road closures and conditions.
Questions about this drive
What is the Wedding of the Waters?
It is where the Wind River becomes the Bighorn River, at the north end of Wind River Canyon near Thermopolis.
How long does Wind River Canyon take to drive?
Shoshoni to Thermopolis on US 20 is 31 miles and takes about 30 minutes.
Are there tunnels in Wind River Canyon?
Yes. US 20 passes through short highway tunnels, which limit overheight vehicles to 18 feet and overwide vehicles to 24 feet.
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Distance, time, elevation, curves and intensity are from Carve's route. Checked 2026-10-28.