Hidden Gems Along Highway 20 in Idaho
Highway 20 in Idaho is one of the most scenic and underrated RV routes in the American West. Stretching across farmland, volcanic landscapes, forested mountains, and high alpine valleys, it serves as a primary gateway for travelers heading toward West Yellowstone and Yellowstone National Park. While many people use it simply as a connector road, those who take their time discover a surprising number of hidden gems along the way.
For RV travelers, Highway 20 offers the perfect mix of convenience and scenery. The road is generally well maintained, services are spaced out but accessible, and detours reveal waterfalls, lakes, hot springs, and quiet natural areas that feel far removed from the main highway traffic. Whether you are beginning your Yellowstone journey or returning from it, this route is full of worthwhile stops that deserve attention.
Harriman State Park
One of the most beautiful hidden gems along Highway 20 is Harriman State Park, located in the Island Park region. This expansive wildlife refuge sits within a historic ranch once owned by the Harriman family and now serves as a protected area filled with wetlands, meadows, and forested trails.
Visitors often encounter elk, moose, sandhill cranes, and bald eagles throughout the park. The calm waters of the Henrys Fork River wind through the landscape, creating peaceful settings ideal for walking, photography, and wildlife viewing. For RV travelers, nearby access roads make it easy to stop and explore for a few hours or even an overnight stay in the surrounding area.
Mesa Falls Scenic Byway
A short detour off Highway 20 leads to one of Idaho’s most breathtaking natural features, Mesa Falls. This scenic byway takes travelers through dense forests before arriving at Upper and Lower Mesa Falls, two powerful waterfalls carved into volcanic rock.
Upper Mesa Falls is the highlight, with water plunging over 100 feet into a dramatic canyon. Viewing platforms allow visitors to safely experience the falls up close while enjoying panoramic views of the surrounding forest. The sound of rushing water combined with the rugged canyon setting makes this one of the most memorable stops along the entire route.
Island Park Reservoir
Island Park Reservoir is another hidden gem that RV travelers often overlook while passing through Highway 20. This long, narrow reservoir is surrounded by forested hills and mountain views, creating a peaceful setting for fishing, boating, and photography.
On calm mornings, the water reflects the surrounding landscape almost perfectly, making it a favorite spot for sunrise and sunset photography. There are several pullouts and recreation areas along the shoreline, making it easy for RV travelers to stop and enjoy the scenery.
Big Springs
Big Springs is one of the most unique natural attractions in the region. Located near Island Park, it is one of the largest natural springs in the United States, producing millions of gallons of crystal-clear water every day.
The spring feeds directly into the Henrys Fork River and is known for its vibrant blue-green water and abundant trout population. Ducks, geese, and other waterfowl are commonly seen floating in the spring, adding to its peaceful atmosphere. A short boardwalk allows visitors to explore the area without disturbing the delicate ecosystem.
Henrys Fork Scenic Corridor
The stretch of Highway 20 that follows the Henrys Fork River is one of the most scenic and relaxing drives in Idaho. This corridor is lined with meadows, wetlands, and forested areas that create ideal conditions for wildlife viewing.
Moose, elk, deer, and a wide variety of birds are frequently spotted along the riverbanks, especially in the early morning and evening hours. The slow-moving river and open landscapes make this section especially appealing for RV travelers who enjoy scenic driving with frequent photo stops.
Chester and Last Chance Area
The small communities of Chester and Last Chance offer quiet, rural charm along Highway 20. While often passed without notice, these areas provide a glimpse into Idaho’s agricultural lifestyle and offer convenient places to refuel or take a break.
Nearby access to rivers and forest roads also makes this a good stopping point for travelers looking to explore off the main highway. The simplicity and quiet atmosphere of these towns contrast beautifully with the more dramatic landscapes found closer to Yellowstone.
Ashton to Island Park Stretch
The stretch between Ashton and Island Park is one of the most scenic portions of Highway 20. This area transitions from farmland into dense forest and eventually into high mountain terrain as you approach West Yellowstone.
Along this route, travelers will find numerous pullouts, fishing access points, and quiet forest roads. The changing elevation creates a variety of landscapes within a relatively short distance, making it a visually rewarding drive for RV travelers.
Cave Falls Road (Seasonal Detour)
For those willing to take a seasonal gravel detour, Cave Falls Road offers access to one of the most remote and peaceful waterfalls in the region. Cave Falls is located within the southern section of Yellowstone’s ecosystem but outside the main park entrances.
The waterfall itself is wide and powerful, surrounded by forest and rarely crowded compared to other attractions. This hidden gem is best visited during dry summer months when road conditions are suitable for RVs or tow vehicles.
Warm River Area
The Warm River area is another quiet gem near Highway 20 that offers excellent fishing, hiking, and relaxation opportunities. The river flows through a shaded canyon surrounded by forest, creating a cool and peaceful environment even during summer heat.
Several campgrounds and picnic areas nearby make this a convenient stop for RV travelers. The clear water and gentle flow of the river make it especially appealing for photography and nature walks.
Tips for Exploring Highway 20 in Idaho
To make the most of your journey along Highway 20, it helps to plan for flexibility. Weather conditions can change quickly in higher elevations, so checking forecasts before exploring side roads is important. Fuel stops become less frequent as you approach Island Park, so keeping your tank topped off is recommended.
RV travelers should also take advantage of early morning and late evening light, which enhances the beauty of forests, rivers, and mountain scenery along the route. Many of the best stops are unmarked or lightly signed, so keeping an eye out for pullouts and recreation areas can lead to unexpected discoveries.
Final Thoughts
Highway 20 in Idaho is far more than a simple route to Yellowstone. It is a corridor filled with hidden natural treasures, quiet landscapes, and unforgettable scenic stops. From the powerful waterfalls of Mesa Falls to the tranquil waters of Island Park Reservoir and the wildlife-rich corridors of Henrys Fork, every stretch of this highway offers something unique.
For RV travelers, this route provides the perfect opportunity to slow down, explore beyond the main attractions, and experience the quieter side of Idaho’s wilderness. Whether you are heading toward Yellowstone or returning from it, the hidden gems along Highway 20 turn an ordinary drive into an extraordinary journey.
