Texas State Highway Spur 77

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State Highway Spur 77 marker

State Highway Spur 77
Route information
Maintained by TxDOT
Length: 0.478 mi[1] (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
Counties: Jeff Davis
Highway system
Loop 76 Spur 78
Spur 77 descending Mt. Fowlkes. Spur 78 ascends Mt. Locke in the distance.

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.[2] 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.


Swisher County[edit]

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.[1]

Jeff Davis County[edit]

The current spur was established in 1991 to provide state highway access to McDonald's growing cluster of observational facilities at the summit of Mt. Fowlkes.[1]

Route description[edit]

The spur begins at McDonald Observatory's complex of facilities at the summit of Mt. Fowlkes including NASA's Laser Ranging System and the Hobby-Eberly Telescope. The spur then follows 0.5 miles (0.8 km) along the saddle of a ridge joining Mt. Fowlkes to Mt. Locke until it terminates at Spur 78 1.0 mile (1.6 km) from SH 118 and 0.5 miles (0.8 km) from the observatory's facilities atop Mt. Locke.

Major intersections[edit]

The entire route is in McDonald Observatory, Jeff Davis County.

mi[1] km Destinations Notes
0 0 Mt. Fowlkes summit Southern terminus
0.5 0.8 Spur 78 Northern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also[edit]


  1. ^ a b c d Transportation Planning and Programming Division. "State Highway Spur No. 77". Highway Designation Files. Texas Department of Transportation. Retrieved 2009-12-12. 
  2. ^ Google (2009-12-12). "Route between Fort Davis and Mt. Fowlkes" (Map). Google Maps. Google. Retrieved 2009-12-12. 

External links[edit]

Route map: Bing

Geographic data related to Texas State Highway Spur77 at OpenStreetMap