Climate
Frenchman Coulee receives very little rain at any time of the year. The summers are typically hot and windy making spring and fall the best time to visit the area. Fog has been known to roll through the Coulee. High Winds are also present at times in the area, sometimes arriving quickly and with little to no warning.
Flora and fauna
Desert brush and small species of cactus exist in the canyon. Some reeds and more lush growth can be found along the small stream leading into the canyon and around the falls.
Landscape
Sandy land surrounded by steep cliff walls. The Coulee exhibits a waterfall near the North Alcove as well as a small stream that flows into the dry bed of the Coulee. The waterfall has been called Frenchman Waterfall, Frenchman's Coulee Waterfall, and Stolp Falls among other names, though consistent record of the actual name is difficult to find. There is a set of basalt columns commonly frequented by climbers located between the north and middle alcove of the Coulee. Frenchman Coulee terminates near the edge of the Colombia River Gorge and is located directly north of Echo Basin.
History
Frenchman Coulee is one of the most beautiful features left behind by the great Ice-Age floods. Frenchman Coulee is a dual coulee and cataract system. Like its neighbor to the north, Potholes Coulee, Scabland floods created Frenchman Coulee. During the first stages of flooding, the water levels between the flood-filled Quincy Basin and the Columbia River immediately west of Evergreen Ridge approached 700 feet over just a few miles. This incredible difference in water levels caused floodwaters to relentlessly eat away the underlying rock layers. Erosion continued for at least as long as it took for the water level in the Columbia Valley to rise to about 1200 feet, or until the floodwater supply was exhausted.