According to a telephone conversation with the pilot, prior to departure he had "four inches of fuel on his fuel stick" which equated to eight gallons of fuel on his fuel reference chart. He intended to fly for thirty minutes. At the time of the accident the pilot estimated that he had thirty minutes or four gallons of fuel remaining. He was cleared for landing when the engine lost power. The pilot attempted to restart the engine but was unsuccessful. During the forced landing the airplane struck a telephone pole, resulting in substantial damage to the right wing; the wing spar and ribs were bent. An examination of both fuel tanks, conducted by the Federal Aviation Administration, revealed less than a quart of fuel. Examination of the airplane revealed no mechanical anomalies. According to the fuel consumption charts located in the pilot operating handbook for a Cessna 177, the flight as planned would have required between six and eight gallons of fuel. According to the handbook, there is one gallon of unusable fuel in this airplane.