In a letter from the Portland District dated 28 March 1975, subject: 'Tidal Hydraulics Committee Services - Umpqua River Entrance, Oregon, ' the Committee on Tidal Hydraulics was requested to assist in the evaluation of navigation problems at the entrance to the Umpqua River. As a result, the 80th meeting of the committee was held in Portland on 20-21 May 1965, primarily to discuss and consider these problems. The history of the project, existing conditions, and maintenance problems were described to the Committee. The report describes the meeting presentations and conclusions.