Best time to go
Needles Highway closes to vehicles with the first snow and does not reopen before April 1; conditions can push the opening later. Check the route’s current status before setting out.
Overview
About Iron Creek Tunnel
Why stop
- A quick, close-up look at the granite along the drive.
Heads up
- Low, narrow clearance rules out large RVs and vehicles towing campers.
Map
Where it is
Loading the Custer map
Full mapPlan your stop
Before you go
Best time to go
The highest, rockiest slopes around here are a summer buffet for grizzly bears.
Custer Tour Guide
Your drive to Iron Creek Tunnel, narrated.
Parkwolf is a GPS audio tour guide for Custer State Park. As you drive, it chimes in with what’s ahead: hidden gems, upcoming stops, history, geology, and wildlife, right through your car’s speakers.
Recorded for this area
When Mud Became Schist0:00 / 0:31
“Some of the Black Hills' dark, flaky rocks began as mud on an ancient sea floor. That mud hardened into shale, then heat and pressure changed it into mica schist.”
Plays on the road 0.1 mi from Iron Creek Tunnel in the Parkwolf Custer Tour Guide.
More stories near here in the app
- Granite's Slow Recipe
- Iron Creek: The Centennial Trail Traverse
- The Pine That Smells Sweet
- Hole-In-Wall: A Bridge and a Rock Opening
- 82 audio storiesacross Custer’s roads, triggered by GPS as you drive
- Wildlife heatmapsfor Bison, Wapiti, Bighorn Sheep, and 13 more
- Works offlinemaps, 40 trails, 49 places, and audio download before you lose signal
- CarPlay readysimple controls built for the drive
“We recently toured Badlands, Custer State Park, Mount Rushmore and more! We learned so much from this app as we toured each of these sites. The audio tours are worth the money.”
Guide
More about Iron Creek Tunnel
A quick hit on the Needles HighwayIron Creek Tunnel is a one-lane passage through a low opening in a massive granite outcrop…
Iron Creek Tunnel is a one-lane passage through a low opening in a massive granite outcrop along the 14-mile Needles Highway. I’d treat it as a quick landmark on the scenic drive, not a separate walk-up stop. The opening is 8 ft 9 in wide and 10 ft 10 in high; large RVs and vehicles towing campers should avoid this road and approach the Sylvan Lake area by SD 89 instead.
Look at the rockThe road slips under fractured gray granite, with trees visible beyond the dark portal.
The road slips under fractured gray granite, with trees visible beyond the dark portal. It takes only moments to pass through, but the rock walls bring the highway’s rugged setting right up beside you. If you’re taking a photo from the car, let a passenger frame the road leading into the opening; no dedicated tunnel pullout was verified.
A road built for the Black HillsFormer South Dakota governor Peter Norbeck marked the highway’s course on foot and horseback,…
Former South Dakota governor Peter Norbeck marked the highway’s course on foot and horseback, and construction finished in 1922. The “Needles” name refers to the needle-like granite formations along the route; the tunnel is one of the close-up encounters with that rock landscape.
Wildlife
Wildlife in Custer
993 sightingsBisonMost seen around 7 AMSighting map
91 sightingsWapitiMost seen around 6 AMSighting map
258 sightingsBighorn SheepMost seen around 7 AMSighting map
85 sightingsMountain GoatMost seen around 7 AMSighting map
256 sightingsBurroMost seen around 6 PMSighting map
707 sightingsPronghornMost seen around 6 AMSighting mapSighting maps show where each species has been reported across Custer. Wildlife moves, so no sighting is guaranteed.
