Merrill J. Mattes

Merrill J. Mattes was an American historian, preservationist, and longtime National Park Service researcher whose career was closely tied to the history of the American West. Born in Congress Park, Illinois, in 1910 and raised largely in Kansas City, Missouri, he studied at the University of Missouri and the University of Kansas before joining the National Park Service in 1935.

Early in his career, he worked at Scotts Bluff National Monument, where he developed a reputation for careful field research and deep knowledge of the overland trails. He later served in broader historic preservation roles for the National Park Service and, according to National Park Service and archival sources, retired in 1975 after leading major historic preservation work at the national level.

Mattes is especially remembered for his writing on trail history, including The Great Platte River Road and Platte River Road Narratives. He was also a co-founder of the Oregon-California Trails Association, and his legacy lives on through collections and libraries that bear his name, reflecting how much his research still matters to scholars, travelers, and general readers.