Phelps City to Rock Port in Atchison County. In 1926, a stretch of road between the two cities was designated as Route 1A. The route was renumbered to Route 102 by 1930, and a project to begin the paving of gravel, which cost $96,800 (), started in April of that year. About three years later, Route 102 was renumbered to Route 4, with the project completed. Route 4 was then later renumbered to U.S. Route 136 in 1951. The current version of the route could be traced back to a supplemental route. Route A was constructed by 1934, as a gravel road from Dorena to Route Y near East Prairie. About five years later, a project to construct a road, designated as Route 102-AP, from Big Oak Tree State Park to Route A was completed. The road appeared on the state map by 1940 as Route 102. Route A was extended northwards from Route Y to Route 105 by 1953, with the section already paved. Another supplemental route, Route PP, was constructed from Route A to Route 55 by 1955. Routes A, PP, and 102 were completely paved by one year later. By 1961, Route 102 replaced Route A from the park entrance westward. The route was repaved near East Prairie in 1965. Route 102 was extended south by 1994, with its new eastern terminus at Route 77 near Dorena. The road from the state park to Route 102 was given the designation of Route RB, and Route PP was replaced by Route 102. The western terminus of Route A was truncated to its intersection with Route 102 south of the state park. Major intersections References External links Big Oak Tree State Park – Missouri State Parks 102 Transportation in Mississippi County, Missouri