At its inception, TVA was based in Muscle Shoals, Alabama, but gradually moved its headquarters to Knoxville, Tennessee, where it is still based. At one point, TVA's headquarters were housed in the Old Federal Customs House at the corner of Clinch Avenue and Market Street. The building is now operated as a museum and is listed on the National Register of Historic Places. TVA was one of the first federal hydropower agencies. Today most of the nation's major hydropower systems are federally managed. But other attempts to create similar regional corporate agencies have failed, and the proposed Columbia Valley Authority for the Columbia River in the Pacific Northwest did not gain approval.