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Green Monarch Ridge by Lake Pend Oreille IDLarge butte with lake in the foregroundSteamboat rock in the foreground with Banks Lake in the distanceDry Lake lake bed and falls blanked with snow.
National Geologic TrailWA / OR / ID / MT

Ice Age Floods National Geologic Trail

NPS / NPS Photo
38/ 100NICHE
parkverdict Experience ScoreIndependent, not sponsored

38 of 100. Our independent metric for how much a unit documents and how easy it is to access, computed the same way for every park so the ranking is reproducible.

Produced by a transparent formula from public NPS data, not a guess. How we score

Our Verdict

Is Ice Age Floods National Geologic Trail worth it?

This is not a park you visit so much as a region you decode.

Spread across four states, the Ice Age Floods trail connects dozens of sites where catastrophic flooding carved coulees, scablands, and gorges across the Pacific Northwest roughly 15,000 years ago. With a score of 38, it rewards the intellectually curious far more than the activity-seeker. There are no maintained loops or campgrounds here, just geology at a scale that genuinely reframes how you see the landscape. Free to access, but it demands planning and a real appetite for the subject.

Who it is for

Road-trippers already moving through WA, OR, ID, or MT who love geology or deep history will find this endlessly rewarding. Families with curious kids can tap the Junior Ranger program. Casual visitors expecting a single destination will be frustrated by the fragmented, self-directed format.

Highlights

  • Auto touring across four states to trace the actual flood path, from the ice dam site in Idaho to the Columbia River corridor
  • Guided tours at select partner sites that explain how ice dam collapses reshaped entire river systems overnight
  • Junior Ranger program that turns the abstract geology into a concrete, kid-friendly investigation
  • Walking self-guided sites where flood-scoured terrain is visible at ground level, making the scale of the catastrophe tangible

Editor's tipBefore you go, download or order the official Ice Age Floods tour map and identify which specific partner sites fall along your existing route, since trying to visit sites across all four states in one trip is impractical. Hours and access vary site by site, so confirm each stop individually before building your itinerary.

What you can do

Activities

Guided ToursSelf-Guided Tours - WalkingSelf-Guided Tours - AutoJunior Ranger Program
Overview

About Ice Age Floods National Geologic Trail

At the end of the last Ice Age, 18,000 to 15,000 years ago, an ice dam in northern Idaho created Glacial Lake Missoula stretching 3,000 square miles around Missoula, Montana. The dam burst and released flood waters across Washington, down the Columbia River into Oregon before reaching the Pacific Ocean. The Ice Age Floods forever changed the lives and landscape of the Pacific Northwest.

When to go

The National Geologic Trail is a collection of sites stretched across a four state area, the weather will vary from site to site. Please check the weather for your local region, or the region you'll be visiting, through their respective sites.