For route-level information, the patron may need to file a Sunshine request with the Commission.
Missouri Historic Bridge Inventory (Fraser, 1996) (MoDOT staff only)
Route/Highway historical societies or websites, such as the Route 66 Association of Missouri, can offer useful resources.
You can also search for individual plat maps in MOBIUS catalog.
State Library Reference Services map case includes county maps from October 1976 and from January 1988. Only available in print.
For aerial maps, see aerial images under Still Images/Photographs
For other county history books, see a print list of county histories at the State Archives reference desk.
For project-level information, see Chief Engineer Monthly Reports 1967-1984 (incomplete). Hard copy is available in Missouri State Archives. Patron may need to file a Sunshine request with the Commission.
Jefferson City
Columbia
Kansas City
St. Louis Post-Dispatch
Need to check out materials from the MoDOT Library or the Missouri State Library? You'll need a Missouri State Library card! 
Apply for a card from the Get a Library Card page of the Reference Services website.
Try local historical societies or museums in your area of research.
Missouri Digital Heritage's Digital Collections may contain local photos.
97 Missouri cities or counties featured in Arcadia Publishing's Images of America series.
Call, email, or visit your local County Historical Society. See also their newsletters.
Call, email, or visit The State Historical Society of Missouri.
Check with the Missouri Department of Transportation (District office). You may have to submit a Sunshine request.
Are there topics or resources of interest not included here that you would like to see?
Let the MoDOT Librarian know!