1972 – 1977
Clark, Dietz & Associates, Engineers, Inc.
1970s
Tyznik, Anthony
1976
Coulter, Ronald M.
June 27 1976
Wayne T. Ottoson & Associates
1970 – 1976
South Dakota Department of Transportation, Office of System Analysis
1975 – 1977
North Dakota State Highway Department, Transportation Services Division
1976
State of Montana Department of Highways, Planning and Research Bureau