Horsethief Butte State Park and The Dalles, OR.
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Ice Age Floods National Geologic Trail

Tour Stop 27 - Horsethief Butte State Park

Horsethief Butte State Park. Shaped by Bonneville and Lake Missoula Floods.
Lower slopes hammered by floodwaters from Lake Bonneville and Glacial Lake Missoula.
1. Lake Columbia Strandlines 8. Moses Coulee 14. Sentinel Gap 20. Streamlined Palouse Hills
2. Steamboat Rock State Park 9. West Bar Giant Current Ripples 15. Mattawa Bar and Erratics 21. Devils Canyon
3. Lake Columbia Varves 10. Potholes Coulee 16. White Bluffs (Hanford Reach) 22. Badger Mountain
4. Dry Falls State Park 11. Frenchman Coulee 17. Drumheller Channels 23. Chandler Narrows
5. Deep Lake Potholes 12. Ginkgo State Park 18. Washtucna Coulee 24. Badger Canyon
6. Lake Lenore Caves 13. Wanapum Clastic Dikes 19. Palouse Falls State Park 25. Wallula Gap
7. Ephrata Fan

A. Logan Pass/Hidden Lake B. National Bison Range C. Camas Prairie Ripples D. Rainbow (Dog) Lake
E. Eddy Narrows - Sandpoint, ID

F. Lake Condon G. Horsethief Butte/The Dalles H. Multnomah Falls Area I. Willamette Meteorite
J. Bellevue Erratic

Glacier National Park National Bison Range Mission Valley Overlook Camas Prairie Giant Current Ripples Rainbow (Dog) Lake Eddy Narrows and Sandpoint, Idaho Lake Condon Horsethief Butte and The Dalles Multnomah Falls Area Willamette Meteroite Trail The Bellevue Erratic Wallula Gap Chandler Narrows Badger Coulee (Canyon) Badger Mountain Devils Canyon Palouse Falls State Park Streamlined Palouse Hills Washtucna Coulee White Bluffs (Hanford Reach National Monument) Drumheller Channels Mattawa Bar and Erratics Sentinel Gap Ginkgo State Park Frenchman Coulee & Echo Basin Potholes Coulee West Bar Giant Current Ripples Moses Coulee Ephrata Fan Deep Lake Potholes Glacial Lake Columbia Varves Steamboat Rock State Park Glacial Lake Columbia


All photos by Tom Foster unless otherwise noted.

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