Frenchman Coulee

Ice Age Floods National Geologic Trail

Frenchman Coulee is a short drive north and west from the Silica Road exit 123 off US-90, along the Old Vantage Road. It is one of the most beautiful features left behind by the great Ice Age Floods. Several of those massive floods, up to 700 ft (213 m) deep, created Frenchman Coulee, its Potholes Coulee neighbor to the north, and scoured the bizarrely eroded surface of Babcock Bench, preferentially eroding weaker rock out of the top of the Grand Ronde Member of Columbia River Basalt.

Frenchman Coulee is actually a dual coulee and cataract system, Frenchman Coulee and Echo Basin, separated by a remnant rock blade that sports tall basalt columns attracting rock climbers like bees to flowers. The Feathers is probably the most popular climbing area in the region.

Hiking trails, some barely discernible, lead along and atop the rock blade, affording spectacular views of both coulees. Frenchman Coulee also has a waterfall in the eastern section of the Coulee that is accessible by foot.

Other hiking and biking trails explore the floor of the coulee and continue over 15 miles north along Babcock Bench, perched high above and adjacent to the Columbia River, past Potholes Coulee and on to Crescent Bar.