The Columbia River is often called the lifeblood of the Pacific Northwest. It flows 1,200 miles from British Columbia, through the inland Northwest, to the Pacific Ocean. A hundred years ago the Columbia was a free-flowing river. Today it's tamed by no fewer than a dozen dams. In part one of a series on the modern day Columbia River system, Correspondent Austin Jenkins takes us on a canoe trip in Northeastern Washington. Today we go searching for history that's hard to find.