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Flat Rock (idaho) — FLAT ROCK (IDAHO)
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State Park

Flat Rock (idaho)

Targhee National Forest · Island Park, ID

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State parks set their own rules and reservation systems. Fire bans, road closures, and operating dates change seasonally — check the state park website before traveling.

Directions

41

Total Sites

0.0

0 Reviews

41 Tent16 RV

Official sources & verification

Managed by State Park

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We display cached information from agency feeds. Hours, fees, permits, closures, fire restrictions, and conditions change without notice. Outdoors is not the permitting authority. Confirm current conditions for this campground using the links above before you go — you are responsible for compliance. Last verified by us: Aug 8, 2026. Spot an error in our data?

Live availability

via Recreation.gov
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Availability is a recent snapshot, not a live hold — you always complete the booking on recreation.gov.

About

Overview Flat Rock Campground is located 22 miles south of West Yellowstone, Montana and 30 miles north of Ashton, Idaho in beautiful Island Park, Idaho. Flat Rock is adjacent to U.S. Highway 20 and the Henry's Fork of the Snake River at an elevation of 6,400 feet. Recreation Henry's Fork has great fly-fishing for rainbow and brook trout. The river's headwaters are at Big Springs, one of the nation's largest springs, just 4.5 miles from the campground. Tubing, canoeing, kayaking and rafting are also popular on the river. The Big Springs National Recreation Water Trail begins at Big Springs and ends just northeast of the campground at Macks Inn. It offers a lazy three-hour float or canoe trip through beautiful scenery. Wildlife, including moose, bald eagles and Sandhill cranes, is often seen along the trail. Hiking, biking, horseback riding and ATVing are popular activities. Many miles of trails crisscross Island Park, including the 2.5-mile Coffee Pot Rapids Trail, which begins at nearby Upper Coffee Pot Campground and meanders along the riverbank. The Continental Divide National Scenic Trail and the Nez Perce Trail are in the area. Island Park Reservoir and Henry's Lake are nearby, both offer boating, water skiing and excellent fishing opportunities. Facilities The campground contains single and double campsites, some of which have 50-amp electric hookups. Sites are equipped with picnic and utility tables, a campfire ring and tent pad. Vault toilets, drinking water and trash collection are provided. All interior roads and parking spurs are gravel. Macks Inn is just across the highway from the campground and offers amenities such as boat rentals, shuttle service, showers, laundry facilities, gas and groceries. Natural Features Island Park is composed of two areas of extinct volcanic activity. The Henry's Fork Caldera sits inside the larger Island Park Caldera. The area is known for its dense forests of lodgepole pine, broad grassy meadows bursting with summer wildflowers and a wide variety of wildlife, including black and grizzly bears, moose, elk, deer, bald eagles, Sandhill cranes and much, much more. A mixed growth of lodgepole pine forest provides partial shade. A portion of one loop is fairly close to the river and some sites have river views. Nearby Attractions Mesa Falls Scenic Byway is 11 miles south of the campground. This 28-mile road leads to scenic overlooks and trails at 110 foot Upper Mesa Falls and 85 foot Lower Mesa Falls. Harriman State Park is 13 miles south. The Henry's Fork meanders through the Harriman, offering excellent fishing. Over 20 miles of trails are available, and wildlife is abundant in this scenic park. Henry's Lake State Park is 10 miles north, offering fishing, a fish cleaning station and boat ramp. Yellowstone National Park's west entrance is just 22 miles north in the town of West Yellowstone, Montana. Visitors enjoy day-tripping to the park for unparalleled wildlife viewing and the beautiful and unique scenery.

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Amenities

Showers
Flush Toilets
Potable Water
Dump Station
Electric Hookups
Sewer Hookups
Wifi
Firewood
Camp Store
Accessible
Picnic Tables
Fire Rings

Check-in & Check-out

Check-in 2:00 PM

Check-out 12:00 PM

Pet Policy

Pets allowed on leash

Campground Rules

  • Campfires generally permitted — verify current fire restrictions before lighting

Reservations

This campground accepts reservations. Book early for popular dates.

Make a Reservation

Individual Sites (41)

B001
B002
#B002

B002

Loop FLAT

Check official pricing Max 8 guests45 ft
CampsiteStandardCampfires
Reserve
B003
#B003

B003

Loop FLAT

Check official pricing Max 8 guests45 ft
CampsiteStandardCampfires
Reserve
B004
#B004

B004

Loop FLAT

Check official pricing Max 8 guests45 ft
CampsiteStandardCampfires
Reserve
B005
#B005

B005

Loop FLAT

Check official pricing Max 8 guests45 ft
CampsiteStandardCampfires
Reserve
B006
#B006

B006

Loop FLAT

Check official pricing Max 8 guests45 ft
CampsiteStandardCampfires
Reserve

In this park

Trails at Targhee National Forest

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Within ~30 miles

Trails near Flat Rock (idaho)

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Hunt context

Hunting units around this campground

During hunting seasons, wear blaze orange and check regulations — see the Montana hunting page

Nearby Campgrounds

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