Henry Malcolm Hay, 76, a retired civil engineer with the Federal Power Commission, died of cancer Monday at Suburban Hospital in Bethesda.

He had worked as a hydraulic engineer on the St. Lawrence River project at Messina, N.Y., and was an alternate member for the St. Lawrence River Joint Board of Engineers of Canada and the U.S.

Mr. Hay joined the FPC in Chicago in 1947 and moved to Washington three years later. He retired in 1972. He had received the agency's Superior Performance Award.

He was born in Dubuque, Iowa, and grew up in California. He attended Occidental College in Los Angeles before transferring to Cornell University, where he graduated with a civil engineering degree.

Prior to World War II, he worked as a civilian with the Army Corps of Engineers in Pittsburgh. During the war, he was a captain with the Army Air Corps and saw Duty in the Philippines.

Mr. Hay was a member of the American Society of Civil Engineers, the Cornell Society of Civil Engineers and the Professional Engineers of D.C. He was a former trustee of Georgetown Presbyterian Church.

He is survived by his wife, Laurae, of the home in Silver Spring.