Texas State Highway Spur 77
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| Route information | ||||
| Maintained by TxDOT | ||||
| Length: | 0.478 mi (0.769 km) | |||
| Existed: | 1991 – present | |||
| History: | Formerly a route in Swisher County | |||
| Major junctions | ||||
| South end: | Mt. Fowlkes summit, McDonald Observatory | |||
| North end: |
 Spur 78
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| Location | ||||
| Counties: | Jeff Davis | |||
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Texas State Highway Spur 77 or Spur 77 is a spur road maintained by the Texas Department of Transportation (TxDOT) connecting the University of Texas at Austin's McDonald Observatory complex atop Mt. Fowlkes to Spur 78 16.3 miles (26.2 km) from Fort Davis. The road is 0.5 miles (0.8 km) long and is located within Jeff Davis County.
Previously, the route designation belonged to a loop road in the Texas Panhandle.
The numerical designation originally belonged to Texas State Highway Loop 77 in the town of Tulia in Swisher County. This original route was in place by the time the state's Highway Designation Files were established in 1939. The Tulia loop began at the intersection of U.S. Route 87 and State Highway 86 and continued east along SH 86 to the present day Farm to Market Road 146. The loop then followed north over the route of FM 146 to the intersection with present-day FM 1318. The loop then continued west back to US 87.
In 1951, the loop designation was dropped along the portions following SH 46 and FM 146, and the designation of the remaining portion was eliminated in 1963 with that stretch reassigned to FM 1318.
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