Baxter Smith, 75, a regional construction engineer with the Federal Highway Administration and its predcessor agency for 44 years before he retired in 1969, died Wednesday at his Arlington home after a stroke.

Mr. Smith was born in Washington. He earned a bachelor's degree in civil engineering at George Washington University.

During his years with the government he worked on engineering plans for the Skyline Drive, the Baltimore-Washington Parkway, and other roads.

Mr. Smith was a member of the National Guard during the 1920s and 1930s. He also had belonged to the Potomac Boat Club, and was a vice president of the Federation of Citizens Associations here during the 1940s.

He was a member of Resurrection Lutheran Church in Arlington, where he had taught Sunday school for many years.

Mr. SMith had served as a Red Cross first aid instructor for 15 years and had been a counselor to scouting organizations in Northern Virginia.

He is survived by his wife, Helen G., of the home; three daughters, Lydia Salmon, of Salt Lake City, Dawn Rawls, of Del Mar, Calif., and Helen Cox, of Charlottesville, Va.; two sons, Baxter Jr., of McLean, and David G., of Charles Town, W. Va.; three brothers, Dr. Benjamin, of Arlington, Griffith G., of Ligonier, Pa., and Hurbert, of Florida; his stepmother, Mary Smith, of Ligonier, and six grandchildren.