Skip to content

Map Activities Discover Guides Trips Saves

A map of everywhere you can sleep outside in the U.S., with the weather and cell signal to match. Built to stay free.

Explore

Map
Hiking
State guides
Discover

Plan

Trip planner
My trips
Saves
Offline downloads

About

Privacy
Data deletion

© 2026 Roaming.Camp · Data from NPS, Recreation.gov, BLM, USFS, NWS, and the FCC.Operating on ceded ancestral land.Photography via Unsplash.

Leave it better than you found it.

Hike

Centennial Bypass 89b

Near Iron Mountain
Inside Black Hills National Forest
Camp 2 mi away

3.5 mi out & back · 572 ft gain · 5,321 ft high point · Moderate

From Iron Mountain Parking

In Black Hills National Forest · SD · U.S. Forest Service

About Elevation Highlights Map Camp near here More hikes

About this hike

Centennial Bypass 89B is a 3.5-mile out and back trail starting at Iron Mountain Parking in Black Hills National Forest with 572 feet of climbing.

Elevation

572 ft of gain round trip.

Camp near here

The closest places to sleep, measured from the trailhead.

See all on the map

2.1 mi from the trailhead
Grizzly Bear Campground
Campground

More hikes nearby

Ranked the same way, within twenty-five miles.

8 mi from you
Flume
- Ends at Sheridan Lake
- Inside Black Hills National Forest
- 3,229 ft of climbing
19.6 mi out & back · 3,229 ft gain · Very hard
Black Hills National Forest · Camp 5 mi away

Out: 270 ft up, returns the same way. Source: USGS 3DEP.

Highlights

What the trail reaches, measured from the start.

ViewpointNearby · 0.0 mi in
ViewpointNearby · 0.0 mi in
Iron MountainNearby · 0.0 mi in

Nearby reading

Iron Mountain (South Dakota)

Map

The route at the trailhead. Drag with two fingers, or hold a key to zoom.

Trail data: USFS, NPS, © OpenStreetMap contributors (ODbL). Elevation: USGS 3DEP via Mapzen terrain tiles. Nearby reading: Wikipedia. Download the trail and feature data.

At a glance

Length: 3.5 mi
Shape: Out & back
Gain: 572 ft round trip
High point: 5,321 ft
Low point: 5,097 ft
Difficulty: ModerateFrom 3.5 mi and 572 ft of climbing
Managed by: U.S. Forest Service
State: SD
Camps within 15 mi: 8
Start: Iron Mountain Parking
Trailhead: 43.8545° N · 103.4375° W

Get directions Open the map

3.1 mi from the trailhead

Iron Creek Horse Camp

Campground

3.6 mi from the trailhead

Horsethief Lake Campground

Campground

15 mi from you

Centennial Trail

Passes Bear Butte
Inside Wind Cave National Park
20,627 ft of climbing

120.2 mi one way · 20,627 ft gain · Very hard

Wind Cave National Park · Camp 1 mi away

Harney # 9 North

Passes Black Elk Peak
Inside Black Hills National Forest
3,190 ft of climbing

13.3 mi loop · 3,182 ft gain · Very hard

Black Hills National Forest · Camp 2 mi away

Horsethief #14

Ends at Horse Thief Lake
Inside Black Hills National Forest
2,337 ft of climbing

14.4 mi out & back · 2,337 ft gain · Very hard

Black Hills National Forest · Camp 2 mi away

Harney # 9 South

Summits Black Elk Peak
Camp 3 mi away

3.4 mi out & back · 981 ft gain · Moderate

SD · Camp 3 mi away

Centennial Horse Bypass

Ends at Sheridan Lake
Inside Black Hills National Forest
3,366 ft of climbing

21.6 mi loop · 3,353 ft gain · Very hard

Black Hills National Forest · Camp 5 mi away

More like this

Hikes that read like this one, wherever they are.

Centennial Horse Bypass
- Ends at Sheridan Lake
- Inside Black Hills National Forest
- 3,366 ft of climbing
21.6 mi loop · 3,353 ft gain · Very hard
Black Hills National Forest · Camp 5 mi away
Iron MTN #16
- Near Iron Mountain
- Inside Black Hills National Forest
- Camp 2 mi away
3.5 mi out & back · 558 ft gain · Moderate
Black Hills National Forest · Camp 2 mi away
Centennial on Mystic
- Passes Sheridan Lake
- Inside Black Hills National Forest
- 6,185 ft of climbing
31.3 mi one way · 6,185 ft gain · Very hard
Black Hills National Forest · Camp under a mile away
Big Hill Loop B
- Inside Black Hills National Forest
- 2,412 ft of climbing
17.4 mi loop · 2,412 ft gain · Very hard
Black Hills National Forest

Signal

Cell coverage here

VerizonLTE · Good
AT&TLTE · Fair
T-Mobile5G · Good

FCC coverage data · signal varies in remote terrain

Weather

7-day forecast

Sun65°43°Mostly Sunny
Mon57°40°Mostly Sunny
Tue61°41°Mostly Sunny
Wed59°41°Sunny
Thu62°44°Sunny
Fri65°46°Sunny
Sat64°Sunny

Sun: Mostly Sunny · wind 7 to 10 mph W

National Weather Service · refreshed hourly