Best attractions and places to see in the Lost River Range include towering peaks, alpine lakes, and historical sites. This region in Idaho offers diverse landscapes, from high-altitude summits to unique geological formations. Visitors can explore challenging trails, discover natural features, and learn about the area's mining and nuclear energy history. The Lost River Range provides opportunities for various outdoor activities and cultural exploration.
Last updated: June 29, 2026
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The small town of Arco is located close to Craters of the Moon National Monument and the Lost River Valley. But what makes it extra special is the fact that it was the first community in the world to be run on nuclear energy starting in 1951. The most prominent and visible feature is Number Hill where – since 1902 – each class of Butte County High School traditionally paints its graduation year on the face of the hill. The town has a gas station, a lovely café, some spots to grab a bite and spend the night. A nearby attraction, besides Craters of the Moon, is the Experimental Breeder Reactor EBR-1 that started producing atomic energy in 1951 and is a historic site nowadays.
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This trail is often used by climbers hiking up to climb "The Fins". This is a great area with loads of climbs ranging from 5.6 to 5.12 with the majority of routes going at the 5.10 range. If you are not into climbing, it is still a neat place to spectate others, enjoy the elevated views, and look at the rock formation.
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Situated at 12,000 feet in the Lost River Range, Merriam Lake is a beautiful place to visit in Salmon-Challis National Forest. The area is home to mountain goats and bighorn sheep, which during mating season you may hear the thunder clash of them butting heads echoing through the valley.
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The approach trail to Borah Peak, Idaho's highest mountain, is wonderfully scenic, although it's also unremittingly steep. It's well-trodden, so you shouldn't have too much difficulty following it up to where the fun begins on Chicken Out Ridge.
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Also known as Mount Borah, Borah Peak is an enticing objective. At 3,859 meters (12,662 ft), it is the highest peak in Idaho. The final ascent to the summit is a bit of a scramble, calling for a head for heights and some experience of this kind of hiking. There are sections where the rocky crest of the superbly named Chicken Out Ridge is narrow.
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The Lost River Range is rich in natural beauty. You can visit Merriam Lake, an alpine lake at 12,000 feet known for its mountain goats and bighorn sheep. The region also features the Big Lost River, ideal for fly fishing, and the Copper Basin, offering an alpine lakes adventure with wildflowers and wildlife. Nearby, Arco is close to Craters of the Moon National Monument and Preserve, a surreal landscape of ancient lava flows and cinder cones.
Yes, the Lost River Range offers excellent wildlife viewing opportunities. Merriam Lake is particularly known for its resident mountain goats and bighorn sheep. The Copper Basin also boasts diverse wildlife. The region is also popular for hunting, with species like mule deer, elk, bighorn sheep, and mountain goats.
The Lost River Range has a fascinating history. You can explore the town of Arco, the first community in the world powered by nuclear energy, and visit the Experimental Breeder Reactor EBR-1, a historic site where atomic energy was first produced. Other historical attractions include the White Knob Historical Mining District and Land of Yankee Fork State Park, which interprets Idaho's frontier mining history and provides access to ghost towns like Bayhorse.
The Lost River Range is a hub for outdoor enthusiasts. Popular activities include hiking, rock climbing, ATV tours, and fly fishing. Experienced climbers are drawn to challenging ascents like Borah Peak and the routes at The Fins, accessible via the Mortal Earth Approach Trail. The region also attracts hang gliders to King Mountain and offers excellent stargazing opportunities within the Central Idaho Dark Sky Reserve.
Yes, the Lost River Range offers a variety of hiking trails. For experienced hikers and climbers, the ascent to Borah Peak, Idaho's highest mountain, is a challenging option with scrambling sections. The Mortal Earth Approach Trail leads to climbing areas. For other options, you can find routes like the difficult Borah Peak Trail, moderate Bear Creek Lake Trail and Merriam Lake Trail, and the easy Lower Cedar Creek Falls Trail. You can find more details on these trails in the Hiking in the Lost River Range guide.
The Lost River Range is renowned for its climbing opportunities. Borah Peak, Idaho's highest peak, offers a challenging climb, particularly via the Mountaineer's Route with its infamous Chicken-Out Ridge. The Fins are another notable climbing area, providing a variety of routes for different skill levels, often accessed via the Mortal Earth Approach Trail.
Number Hill is a prominent and unique feature near the town of Arco. Since 1902, each graduating class of Butte County High School traditionally paints its graduation year on the hillside, creating a living historical record visible from the town.
Yes, the Lost River Range is an excellent destination for stargazing. The Central Idaho Dark Sky Reserve, an internationally recognized area, offers exceptional night sky quality with minimal light pollution, making it a premier spot for astronomy enthusiasts. Craters of the Moon National Monument and Preserve, located near Arco, is also a designated Dark Sky Reserve.
Beyond its towering peaks, the Lost River Range features unique geological formations. The Fins are a dramatic rock formation popular for climbing. Nearby, Craters of the Moon National Monument and Preserve showcases a surreal landscape of ancient lava flows, cinder cones, and lava tubes. The range also contains numerous hidden caves and caverns for those interested in caving or spelunking.
Visitors to the Lost River Range particularly enjoy the challenging and scenic hikes, such as the approach to Borah Peak. The stunning alpine scenery, especially around Merriam Lake, and the opportunities to spot wildlife like mountain goats and bighorn sheep are also highly appreciated. The unique historical sites, like the town of Arco and EBR-1, also draw significant interest.
Absolutely. The Lost River Range offers several sites to delve into Idaho's rich mining history. You can visit the White Knob Historical Mining District, which features ruins, relics, and interpretive signage. The Land of Yankee Fork State Park and Interpretive Center also focuses on frontier mining history, providing access to ghost towns like Bayhorse. Additionally, the Mackay Mine Hill Tour takes visitors through historic mining roads and ruins above Mackay.


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