The National Geologic Trail is a 3,380-mile driving route through working landscapes, public lands, towns, and remote country. Use the terrain guide to choose places, then confirm access with the agency that manages each stop.
These are high-impact access changes, not a complete alert feed. Conditions, fire restrictions, road access, hours, fees, and seasonal closures can change quickly. The linked managing-agency page is authoritative.
Reviewed July 14, 2026
The visitor center, its parking lot, restrooms, and outdoor overlook are closed for renovation from April 1 through December 31, 2026. Sun Lakes-Dry Falls State Park remains open, with other park viewpoints available.
Washington State Parks project notice →Palouse Falls is a day-use site. Castle Rock and access to the cliffs and plunge pool are permanently closed. Stay at designated viewpoints and within developed areas.
Washington State Parks management plan →Many of the best flood features are far from visitor centers. A map pin does not establish public access, a maintained trail, or safe parking.
These stops pair major flood evidence with a current managing-agency page. Open the terrain map for context, then check the official link immediately before travel.
Dry cataract, coulee lakes, Umatilla Rock, and access to Terrain360 coverage.
A basalt butte isolated by floodwater, with summit views into the coulee.
An active cataract and plunge pool within a much larger flood-carved canyon.
Columbia River passage, Horsethief Butte, trails, and cultural landscapes.
A Belt Supergroup boulder rafted hundreds of miles in glacial ice.
Search all 103 documented sites and compare them with flood extent and 360 routes.
This Terrain360 guide is independent. NPS materials provide the official national trail overview, regional suggestions, and downloadable route maps.