Internationally recognized mountaineer John Roskelley of Spokane came down to sea level for his latest adventure, compiling 1,200 miles of sea kayaking on the mighty Columbia into a guidebook for boaters, especially those traveling by muscle power. “Paddling the Columbia: A guide to all 1,200 miles of our scenic and historical river,” (Mountaineers: $25) details 35 travel segments from the river’s source in British Columbia downstream to the Pacific Ocean.