The Joann Harwell calculation and the 1990 installation
The Adrian midpoint claim traces to Joann Harwell, a longtime Adrian resident and amateur Route 66 historian who in the late 1980s undertook to calculate the exact mathematical midpoint of Route 66 from publicly available state-by-state mileage data. Harwell's calculation used the official 1926-to-1985 Route 66 alignment — the road as it existed for its full federally-designated lifespan — totaling approximately 2,278 miles from Chicago to Santa Monica. Dividing that distance by two yielded the exact midpoint at 1,139 miles from each end, which Harwell determined fell within the town limits of Adrian, Texas.
Harwell took the calculation to the Texas Department of Transportation and to the Texas Route 66 Association, both of which verified her math and supported the installation of a permanent marker. The original sign was installed in 1990 — a modest wooden plaque approximately three feet tall mounted on a four-by-four post — and was accompanied by a small ceremony attended by state and local Route 66 enthusiasts. The Midpoint Cafe across the road quickly began promoting itself as the official midpoint cafe, and Adrian's identity as the Route 66 midpoint town was established.
The original sign was replaced in the early 2000s with the larger, more visible sign that travelers photograph today, as Route 66 tourism grew through the 1990s and the modest original was found to be inadequate for the volume of visitors stopping to photograph it. The new sign is approximately eight feet wide, easily readable from the highway, and large enough to dominate group photographs of even substantial Route 66 travel parties. The original 1990 plaque was preserved and is now displayed inside the Midpoint Cafe as part of the cafe's Route 66 memorabilia.
