 After retiring in 1937, Smith remained as a consulting engineer for the State of Illinois waterways division from 1937 to 1946.He was also the author of the "Stream Flow Data of Illinois", a 1937 work of the Illinois Division of Waterways (which he headed) and the U.S. Geological Survey.In 1889, Smith married Nettie Babcock McDonald, a fellow South Carolina native born in September 1866.