Depoe Bay to Choteau: A Road Trip Guide

Depoe Bay, Oregon, claims the title of the world's smallest navigable harbor, a fitting start for a road trip that weaves through two distinct American landscapes. This route to Choteau, Montana, spans roughly 800 miles, crossing the Cascade Range, the high desert of eastern Oregon, and the Rocky Mountain front. The journey rewards drivers with dramatic geological contrasts: from coastal basalt cliffs to volcanic plains and the rugged peaks of the Rockies.

The primary route follows US-20 east from Depoe Bay through Corvallis and Bend, then connects to I-84 eastbound near Ontario, Oregon. From there, I-84 continues into Idaho, transitioning to I-15 north at Pocatello, and finally US-89 north through Montana to Choteau. Highway conditions are generally excellent, with long stretches of well-maintained interstate and state roads. However, mountain passes like Santiam Pass (elevation 4,817 ft) can experience snow from October through May, so check forecasts.

Fuel costs vary significantly along the route: Oregon typically has lower gas prices than Idaho or Montana. Planning fuel stops in larger towns like Bend, OR, and Idaho Falls, ID, can save money. As of 2025, average gas prices are approximately $3.80/gal in Oregon, $3.50 in Idaho, and $3.60 in Montana, but these fluctuate. Budget roughly $120-$150 for fuel for a standard sedan over the entire trip.

Given the 12-14 hour drive, plan for at least two overnight stops. Safe and clean rest areas are abundant, especially at interstate rest stops in Idaho and Montana, which often feature picnic tables and pet-friendly areas. For families, consider stops at Crater Lake National Park (a short detour from US-97 south of Bend) or the Museum of Clean in Pocatello, ID, which offers interactive exhibits. Both destinations provide educational entertainment for children.

Pet owners should note that many restaurants with outdoor seating are pet-friendly, but national parks have strict pet restrictions (pets not allowed on trails). Always carry water and a bowl for your pet. For fatigue management, the how to find the best stops and hidden gems between cities guide recommends scheduling a break every two hours. The route's long, straight stretches in Idaho and Montana can lull drivers into drowsiness, so use rest areas to stretch and stay alert.

After leaving the coast, the drive crosses the Cascade Range, where Mount Jefferson and the Three Sisters dominate the horizon. In central Oregon, the Newberry National Volcanic Monument showcases a massive caldera, and the high desert's sagebrush plains stretch for miles. Farther east, the Snake River Plain in Idaho is a volcanic flood basalt province, a testament to massive lava flows millions of years ago. The approach to Choteau brings the Rocky Mountain Front into view, with the towering peaks of the Bob Marshall Wilderness.

Local commerce along the route reflects its rural character. Small towns like Sisters, OR, and Arco, ID, offer quirky shops and diners serving regional specialties. Arco is notable for being the first town in the world lit by nuclear power (1955) – a fact memorialized at the local museum. In Choteau, the Old Trail Museum provides insight into the area's paleontological history, with fossils of dinosaurs and marine reptiles.