Ice Age Floods National Geologic Trail
Montana, Idaho, Oregon, Washington
Free entry
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.
No entrance fee.
Hours
The Ice Age Floods National Geologic Trail is a collection of sites operated and owned by a variety of partners. , Hours of operation and season will vary from site to site. Please check each respective site for more details and information.
Conditions
Weather now: ☀️ Clear, 79°F
⛅ 88°/56°
☁️ 92°/59°
☁️ 95°/66°
Not an official safety source — always defer to NPS.gov and rangers for life-safety decisions.
How Ice Age Floods National Geologic Trail connects
This park's activities, topics, location, and on-the-ground places — one hop in the graph. Drag to explore; click an activity, topic, or related park to follow it.
Park
Activity
Topic
State
PassportStamp
Similar parks
Share activities & topics with Ice Age Floods National Geologic Trail.
