Flat Rock (Idaho)
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.
More like this: electric hookups in Idaho · reservable in Idaho · big rigs in Idaho
Check availability on Recreation.gov ↗



Site mix
| Standard, no hookups | 10 |
| Standard with electric | 6 |
| Host/management | 25 |
Site guide
Will my RV fit
The longest site here provides 65 feet of vehicle capacity. Most sites are shorter.
16 sites. Tap a filter to narrow the list; the map follows.
| Site | Type | Entry | Fits, ft | Surface | Shade | Power | People / vehicles | Fires |
|---|---|---|---|---|---|---|---|---|
| B002 | Electric | Back-in | 45 | Gravel | Partial | 50 amp | 8 / 1 | Yes |
| B003 | Standard | Back-in | 45 | Gravel | No | 8 / 1 | Yes | |
| B004 | Standard | Back-in | 45 | Gravel | No | 8 / 1 | Yes | |
| B005 | Electric | Back-in | 45 | Gravel | Full | 50 amp | 8 / 1 | Yes |
| B006 | Electric | Back-in | 45 | Gravel | Full | 50 amp | 8 / 1 | Yes |
| B007 | Electric | Back-in | 50 | Gravel | Partial | 50 amp | 8 / 1 | Yes |
| B008 | Electric | Back-in | 50 | Gravel | Partial | 50 amp | 8 / 1 | Yes |
| B009 | Electric | Back-in | 50 | Gravel | Full | 50 amp | 16 / 3 | Yes |
| B010 | Standard | Back-in | 45 | Gravel | Full | No | 8 / 1 | Yes |
| B011 | Standard | Back-in | 50 | Gravel | Full | No | 8 / 1 | Yes |
Per-site records as published by the managing agency on Recreation.gov. Blank cells mean the agency listed nothing for that site. Check-in 2:00 PM, checkout 12:00 PM.
Amenities & rules
| Hookups | Electric |
| Max vehicle length | 65 ft |
| Equipment | RVs & trailers, Tents |
| Campfires | Allowed, subject to restrictions |
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.
Individual sites vary. Confirm on Recreation.gov or with the managing office.
Weather by month
Getting there
From West Yellowstone, Montana, take U.S. Highway 20 south for 22 miles, or from Ashton, Idaho, take U.S. Highway 20 north for 30 miles. The campground entrance is 1/4 mile south of Macks Inn on the west side of the highway.
| Nearest town | Island Park, Idaho |
| Coordinates | 44.4969° N, 111.3400° W · Directions ↗ |
Supplies & services
| Dump station | Dump station ↗ | 15.9 mi |
| Outdoor gear | Eagle's Curios ↗ | 16.3 mi |
Locations © OpenStreetMap contributors. Call ahead; hours change seasonally.
Explore
Video
CampgroundViews.com - Flatrock Campground Island Park Idaho Forest Service
Worth a stop
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.
- 3.9 miMccrea Bridge Boat Ramp ↗Boat launch
- 5.4 miMill Creek Boat Ramp ↗Boat launch
- 6.2 miBox Canyon Trailhead ↗Trailhead
- 10.4 miLast Chance Fisherman Access Fishing Site ↗Fishing site
- 12 miTarghee Creek Trailhead ↗Trailhead
- 12.3 miHoward Springs Picnic Site ↗Day use
Trails nearby
- 1.4 miCoffee Pot Rapids2.1 mi trail · hiking, horse, bike
- 3.2 miPonds Trail2.4 mi trail · hiking, horse, bike, motorcycle and 2 more
- 3.2 miShotgun Trail A0.07 mi trail · hiking, horse, bike, motorcycle and 2 more
- 3.2 miShotgun Trail0.6 mi trail · hiking, horse, bike, motorcycle and 2 more
- 3.4 miBig Springs Interpretive Trail ↗0.9 mi trail · hiking, horse, bike
- 3.7 miLakeside Trail1.5 mi trail · hiking, horse, bike, motorcycle and 2 more
Trail and trailhead records are the Forest Service's. Distances are straight-line to the nearer trail end. Trail conditions are not tracked here.
Other campgrounds nearby
Cabin and lookout rentals nearby
On the National Register nearby
- Eleanor Albaugh CabinBuilding · Island Park · 0.7 mi
- Johnny Sack CabinBuilding · Big Springs · 4.2 mi
- Glen and Addie Crabtree CabinBuilding · Island Park · 5.7 mi
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.
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.
Guidebooks for Idaho
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Titles come from Open Library's catalog, matched by subject heading or by title.
Reference
Questions people ask
Do I need a reservation at Flat Rock (Idaho)?
Sites at Flat Rock (Idaho) are reservable on Recreation.gov. Any walk-up sites are listed on the booking page.
Source: Recreation.gov
What time is check-in at Flat Rock (Idaho)?
Check-in 2:00 PM, checkout 12:00 PM.
Source: Recreation.gov
How many sites does Flat Rock (Idaho) have?
41 sites, including 10 standard sites without power and 6 standard sites with power.
Source: Recreation.gov
Will my RV fit at Flat Rock (Idaho)?
The longest site here provides 65 feet of vehicle capacity. Most sites are shorter. The sidebar tool checks a trailer or motorhome length against every site.
Source: Will my RV fit
Does Flat Rock (Idaho) have hookups?
Yes, electric hookups at some sites.
Source: Recreation.gov
Are there showers or a dump station at Flat Rock (Idaho)?
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.
Source: Recreation.gov
Can I have a campfire at Flat Rock (Idaho)?
Fires are allowed in the provided rings under normal conditions.
Source: Recreation.gov
Is there cell service at Flat Rock (Idaho)?
FCC coverage maps show Verizon 5G and T-Mobile 5G at the campground point. Terrain changes that from one site to the next.
Source: FCC Broadband Map
What is there to do at Flat Rock (Idaho)?
Henry's Fork has great fly-fishing for rainbow and brook trout. The Recreation section on this page has the rest.
Source: Recreation
What is the nearest town to Flat Rock (Idaho)?
Island Park, Idaho. Mesa Falls Scenic Byway is 11 miles south of the campground.
Source: Getting there
What if Flat Rock (Idaho) is full?
The nearest public campgrounds are Upper Coffee Pot (1.3 mi), Big Springs Warming Hut (2.1 mi, partly first-come), and Mccrea Bridge (3.8 mi).
Source: Campgrounds nearby






