On a soggy May morning, Bruce Ely and Jamie Francis stuffed a Chevy Blazer and set off east. Among the cameras, tripods and camping gear was a shared dream of creating a beautiful and lasting film from the Columbia River. The result — “Columbia River: Great river of the West” — is the product of a four-month search, a quest to discover the unseen. Along the way, they learned that the Columbia unifies and divides, provides and provokes, but also sustains and defines us.