The Columbia River presented special challenges to the expedition, not the least of which was a very narrow gorge and extremely dangerous rapids. Without faltering, the men negotiated canoes and cargo through the gorge and chaotic rapids beyond without a major mishap. Afterwards, they enjoyed a few days of relatively tranquil travel on the river before encountering more rapids along the Cascades portion of the Columbia. Gear and supplies were portaged across this section, but the canoes and their occupants were sent racing down the river. They emerged from the foaming water unharmed.