Ice Age Floods National Geologic Trail
Designation: National Geologic Trail
Location: Washington, Oregon, Idaho, Montana
📘 Park Overview
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.
🌤 Weather Information
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.
🚗 Directions
To Trail Headquarters from Spokane Take I-90 West At Exit 277, merge onto US-2 toward Davenport/Fairchild AFB/Spokane Airport Just past Wilbur, turn right onto WA-21 Stay left onto Highway 174 Turn right onto WA-155 Stay on WA-155 past Grand Coulee Dam and into the town of Coulee Dam Cross the Columbia River and continue on WA-155 Turn right onto Crest Drive and follow up the hill. The HQ Office is located on the left
Images
Green Monarch Ridge by Lake Pend Oreille ID
Credit: NPS Photo
Steamboat Rock State Park, Washington
Credit: NPS
Banks Lake view from Steamboat Rock
Credit: NPS
Dry Lake lake bed and falls in winter
Credit: NPS Photo
A beautiful shot from the ledge near the visitor's center in the Dry Falls area.
Credit: NPS/Cline
Green Monarch Ridge by Lake Pend Oreille ID
Credit: NPS Photo
Steamboat Rock State Park, Washington
Credit: NPS
Banks Lake view from Steamboat Rock
Credit: NPS
Dry Lake lake bed and falls in winter
Credit: NPS Photo
A beautiful shot from the ledge near the visitor's center in the Dry Falls area.
Credit: NPS/Cline
Activities
Topics
Operating Hours
Entrance Fees
No entrance fees listed.
Entrance Passes
No entrance passes listed.
3-Day Weather Forecast
Tuesday, Feb 17
Sunny
High: 48.2°F | Low: 32.2°F
Humidity: 75%
Wind: 8.3 mph
Rain Chance: 0%
UV Index: 0.3
Sunrise: 06:56 AM
Sunset: 05:25 PM
Moon: New Moon (0%)
Visibility: 6 mi
Dew Point: 33.4°F
Cloud Cover: 0%
Pressure: N/A mb
Air Quality (PM2.5): N/A
Ozone: N/A
EPA Index: N/A
Wednesday, Feb 18
Partly Cloudy
High: 47.1°F | Low: 29.7°F
Humidity: 76%
Wind: 11.9 mph
Rain Chance: 0%
UV Index: 0.3
Sunrise: 06:54 AM
Sunset: 05:26 PM
Moon: Waxing Crescent (0%)
Visibility: 6 mi
Dew Point: 31.5°F
Cloud Cover: 0%
Pressure: N/A mb
Air Quality (PM2.5): N/A
Ozone: N/A
EPA Index: N/A
Thursday, Feb 19
Mist
High: 41.5°F | Low: 26.2°F
Humidity: 81%
Wind: 8.3 mph
Rain Chance: 0%
UV Index: 0.2
Sunrise: 06:53 AM
Sunset: 05:28 PM
Moon: Waxing Crescent (3%)
Visibility: 5 mi
Dew Point: 30.2°F
Cloud Cover: 0%
Pressure: N/A mb
Air Quality (PM2.5): N/A
Ozone: N/A
EPA Index: N/A
Weather Alerts (2)
Winter Weather Advisory issued February 16 at 10:51PM PST until February 18 at 3:00PM PST by NWS Pendleton OR
Effective: Feb 17, 2026 1:51am
Expires: Feb 17, 2026 10:15am
* WHAT...Snow. Additional snow accumulations up to 8 inches.
* WHERE...In Oregon, Northern Blue Mountains of Oregon. In
Washington, Northwest Blue Mountains.
* WHEN...Until 3 PM PST Wednesday.
* IMPACTS...Travel could be difficult due to periods of moderate to
heavy snow.
* ADDITIONAL DETAILS...Multiple rounds of snow are forecast through
Wednesday. Highest snow totals of 5 to 8 inches are expected above
4500 feet, with lower totals of 2 to 6 inches down to 3000 feet.
Winter Weather Advisory issued February 17 at 4:44AM PST until February 18 at 3:00PM PST by NWS Pendleton OR
Effective: Feb 17, 2026 7:44am
Expires: Feb 17, 2026 7:00pm
* WHAT...Snow showers. Additional snow accumulations of 4 to 6
inches.
* WHERE...In Oregon, Northern Blue Mountains of Oregon. In
Washington, Northwest Blue Mountains.
* WHEN...Until 3 PM PST Wednesday.
* IMPACTS...Travel could be difficult due to periods of moderate to
heavy snow.
Park Events
UNESCO International Geodiversity Day
The International Geodiversity Day was established by the 41st session of the UNESCO General Conference!! From now on, the 6th of October will be an annual worldwide celebration, raising awareness across society about the importance of non-living nature for the well-being and prosperity of all living beings on the planet!
Geodiversity is all around you. It is all the parts of nature that aren't alive; including the Earth's minerals, rocks, fossils, soils, sediments, landforms, topography, geological and morphogenetic processes, and hydrological features such as rivers and lakes.
The winner of the competition for the International Geodiversity Day logo, Silas Samuel dos Santos Costa, is a student at Universidade Federal do Rio Grande do Norte (Natal, Brazil) and produced the logo that can be freely used in all initiatives related with the International Geodiversity Day. Congratulations Silas!
The website geodiversityday.org is the virtual focal point for all information regarding this International Day. New social media feeds were launched that you can use to stay updated with plans for International Geodiversity Day:
facebook.com/GeodiversityDay
twitter.com/GeodiversityDay
Location: Worldwide
Date: Oct 6, 2022 12:00am to Oct 6, 2022 12:00am
Paid Event
Visitor Center & Contacts
📍 Physical Address:
Program Manager
Ice Age Floods National Geologic Trail
Coulee Dam, WA 99116
🏤 Mailing Address:
Program Manager
Ice Age Floods National Geologic Trail
Coulee Dam, WA 99116
📞 Voice Phone: (509) 237-9722
✉️ Email: iafl_program_manager@nps.gov