Idaho Falls to Salmon Road Trip Guide: Scenic Drive Through Eastern Idaho

Did you know that Idaho Falls and Salmon are connected by the historic Lewis and Clark Highway (US-20/US-93), a route that partially traces the path of the Corps of Discovery? This drive covers about 140 miles and typically takes 2.5 to 3 hours without stops, but the landscapes and attractions demand a full day of exploration.

The route begins on the flat, agricultural Snake River Plain at Idaho Falls (elevation 4,745 ft) and climbs into the rugged Salmon River Mountains, ending in Salmon (elevation 4,004 ft). The most direct path is via US-20 West to I-15 South, then US-26 West/US-93 North. This guide answers is it worth driving Idaho Falls, ID to Salmon, ID with a resounding yes, and helps you find things to do between Idaho Falls, ID and Salmon, ID.

Discover how to find the best stops and hidden gems between cities with our expert tips.

Route Overview Table

This route is generally safe, but watch for wildlife (deer, elk) especially at dawn/dusk between Mackay and Salmon. Gravel trucks and RVs are common; pass with caution. Speed limits: 65-70 mph on highways, 45 mph in towns.

• Hidden off-route spot: Big Lost River Recreation Area (west of Mackay) offers hot springs and camping. Turn onto ID-22 at Mackay, drive 6 miles south.
• Family activity: Craters of the Moon has a Junior Ranger program; kids can earn badges. The monument is pet-friendly on leash (except inside buildings).
• Fatigue management: Rest stops at Craters of the Moon (picnic tables), Arco (city park), and at milepost 57 on US-93 (scenic pullout). Recommended break intervals: every 1.5 hours.

Climatic conditions vary: summers (100°F on plain; 80°F in mountains); winters (20°F, snow common). Route aesthetics peak in late June (wildflowers) and late September (fall colors). For pet-friendly framework, keep dogs leashed and bring water, especially in summer when pavement gets hot.

The drive transitions from the broad Snake River Plain, with its irrigated farms and distant mountains, to the volcanic landscapes of Craters of the Moon National Monument and Preserve (a UNESCO World Heritage Site candidate). Lava flows, cinder cones, and sagebrush dominate the middle leg. Near Mackay, the Lost River Range comes into view, home to Idaho's highest peak, Borah Peak (12,662 ft). The final stretch follows the Salmon River canyon, a designated Wild and Scenic River, with steep cliffs and pine forests.

• Craters of the Moon: Visitor center, loop drive (7 miles), short hikes (e.g., Inferno Cone, 0.2 miles). Entrance fee: $20/vehicle.
• Salmon River Canyon: Overlooks on US-93, fishing spots, and the historic town of Salmon (population 3,000), known for its Old West architecture.
• Local commerce: Arco's businesses revolve around the nuclear research site (INL); Mackay has a few eateries (Idaho Street Market); Salmon offers farm-to-table dining at the Salmon River Inn.

Idaho Falls itself is home to the Idaho Falls River Walk, the Museum of Idaho, and the Taylor Bridge (pedestrian). The city's culinary scene includes the Cadillac Ranch (steaks) and the Snakebite Restaurant (Mexican). In Salmon, the Salmon River Brewery is a favorite, serving local craft beers and pub fare.

Fuel stops are sparse between Arco and Salmon, with a critical gap of about 100 miles with no services. The best stops Idaho Falls, ID to Salmon, ID for refueling include Idaho Falls (multiple stations), Arco (Sinclair/Valero), Mackay (small station), and Salmon (at destination). Gas prices tend to be higher in smaller towns; fill up in Idaho Falls where prices are competitive.

• Estimated fuel cost: $20-$30 for an average sedan (assuming 25 mpg and $4/gal).
• Driving time: 2.5 hours non-stop, but plan 4-6 hours with stops.
• Road quality: Excellent paved highways (US-20, I-15, US-93) with occasional rough patches near Mackay due to frost heaves.
• Cell service: Reliable on US-20 and I-15; spotty on US-93 between Mackay and Salmon (AT&T and Verizon have moderate coverage).

For families, child safety seats are mandatory in Idaho. Restrooms are available at gas stations in Idaho Falls, Arco, Mackay, and at Craters of the Moon National Monument (the primary attraction along the route). No toll roads exist on this route.