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R-338 · Route File

Iron Mountain Road

Black Hills, South Dakota · United States

The 17-mile US 16A scenic road between Custer State Park and the Mount Rushmore area, built around pigtail bridges and single-lane rock tunnels.

Primary window
Spring - autumn preferred for motorcycles
References
8
Coverage
established
Reviewed
Jul 2026

Operational warnings

red · Confirmation required

Iron Mountain Road closes periodically in winter when snow and ice cannot be cleared safely.

The US 16A scenic connection between Custer State Park and the Mount Rushmore area may be unavailable while larger surrounding highways remain open.

Planning response: Confirm US 16A in South Dakota 511 and Custer State Park notices before using the scenic road in winter conditions.

Seasonal windows are planning triggers, not a substitute for current road, weather or land-access reports. Recheck the official sources below before departure.

Route tire evidence

Tires reported on Iron Mountain Road

No reviewed tire observation is published for this route.

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No tire name is inferred from route popularity, forum mentions or marketing. A report appears only after its tire, motorcycle, route context, date and named source are reviewed.

Route-specific references

Sources for Iron Mountain Road

Information tied directly to this road, track or route.

Regional reference desk

Authorities covering the wider journey

Shared road, weather and access services used across Route Files in this region.

Field Links are reviewed references, not live guarantees. Conditions, closures, services and regulations change. Confirm critical information with the responsible authority before relying on it.