Clifford Jay Harriman, 73, who retired in 1972 after 35 years with the National Park Service, died Friday at Fairfax Hospital after a heart attack.

He came to the Washington Planning and Service Center of the Park Service in 1966 and was in charge of formulating a plan for acquisition of park lands in connection with the Mission 66 program.

Later, Mr. Harriman was in charge of evaluation of land activities for the entire Park Service. He received the Interior Department's Meritorious Service Award in 1971.

He was born in Dodd, Wash. He was a graduate of the University of Idaho and the Jackson (Miss.) School of law.

Mr. Harriman began his National Park Service career in 1937 as a ranger in Shenandoah National Park in Virginia. From 1940 to 1956, he was chief ranger of the Natchez Trace Parkway in Mississippi.

He then served as regional chief of lands in the Richmond Regional Office, managing land acquisitions and water rights programs for national park areas in the southeastern States.

Mr. Harriman was a member of the Masons and the Shrine.

He is survived by his wife, June T., of the Home in Vienna; two sons, Stephen J., of Norfolk, and Thomas T., of Rabat, Morocco, and three grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Rose Park United Methodist Church in Madison, Va.