Abstract: Files consisting of the original certified plats submitted by the town and village boards and city councils pursuant to section 86.302(1) of the Wisconsin Statutes and federal 23CFR 460 and 23 USC 402(c). The maps show state trunks, county trunks, local roads, and bridges. Certification was accomplished annually until 1990, biennially thereafter. Included are files for the years 1946, 1951, 1961, 1971, 1981, and 1992. Plats, certified mileage statements, and other information are used for apportioning federal highway safety funds and state transportation aid payments. This information is also used in annexations, jurisdictional transfers of road authority, and the construction/realignment of roads. These plats provide the state official a singular graphic compilation showing cumulative and historical impacts of administrative and jurisdictional changes on highways in all Wisconsin municipalities. Plats are also used after each decennial census to realign congressional, state, and local districts to reflect population trends. The certified plats are a basic document used by the Legislature and State Cartographer to reapportion the state into equal voting districts by population.