Columbia Falls to Depoe Bay: Epic Road Trip Guide

Departing from the Flathead River's headwaters, this route traces the historic Mullan Road, a military wagon trail blazed in 1859 that linked the Missouri and Columbia rivers. The 850-mile journey follows US-2, I-90, and US-20, crossing the Continental Divide at Homestake Pass (elev. 6,329 ft) and the Cascade Range at Santiam Pass (elev. 4,817 ft).

Driving time is roughly 14 hours without stops, but veteran road-trippers budget two to three days to savor the region's geological drama: from Montana's glacier-carved valleys to Oregon's volcanic Cascades and the Pacific's crashing waves.

Plan fuel stops roughly every 200-250 miles; remote stretches like eastern Oregon's high desert have sparse services. Gas prices average $3.20/gal in Montana and $3.80/gal in Oregon, where state law prohibits self-service pumping (an attendant fills your tank).

Ultimate road trip hack: check gas prices via apps like GasBuddy and plan to fill in larger towns like Missoula, Boise, and Bend, where competition lowers costs. Expect a total fuel budget of $150-200 for a standard sedan.

• I-90 through Idaho and Montana is well-maintained with 70-75 mph speed limits.
• US-20 in Oregon is a two-lane highway with 55 mph zones; watch for slow recreational vehicles on grades.
• Rest areas are plentiful every 50-70 miles; most have picnic tables and restrooms.

Mountain passes may close in winter (Nov-Mar); always check road conditions via 511 services. Tire chains are recommended for I-90's Lookout Pass and US-20's Santiam Pass. Family-friendly attractions include the Metolius River's fish hatchery (free petting troughs) in Oregon and the Museum of Mountain Flying in Missoula.

For drivers, fatigue can be countered by taking breaks every 2 hours or 100 miles; notable rest stops include the Yellowstone Stagecoach Rest Area (mile 459 on I-90) and the Hoodoo Ski Area parking lot (US-20). Both have scenic views and photo ops.

• Pet-friendly motels are common; check for 'pet fee' ($10-20/night).
• Designated dog parks: Missoula's McCormick Dog Park and Bend's Pine Nursery Dog Park.
• Hidden gems: the ghost town of Bonanza, ID (off I-15) and the painted hills of Oregon (John Day Fossil Beds, detour from US-20).

Three national forests, two national monuments, and one UNESCO World Heritage Site line this route. The crown jewel is Yellowstone National Park (detour from Bozeman, +2h) and the nearby Montana Dinosaur Trail, but the route itself offers Glacier National Park's east side (access via US-2) and Idaho's Sawtooth National Recreation Area. In Oregon, Newberry National Volcanic Monument showcases a 600,000-year-old caldera, and the Columbia River Gorge (via I-84) presents 2,000-foot basalt cliffs.

Local commerce along the way includes huckleberry stands in Montana (try huckleberry pie at Bigfork's The Old Town Café), Basque cuisine in Boise (sample chorizo at Bar Gernika), and craft breweries in Bend (over 20, including Deschutes Brewery). These pit stops offer authentic regional flavors.

• Deer and elk are active at dawn and dusk; use high beams on rural roads.
• Huckleberry season runs mid-July to September; foragers sell fresh berries illegally on road verges.