Nevada State Route 722
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| Carroll Summit Road | ||||
| Route information | ||||
| Maintained by Nevada DOT | ||||
| Length: | 58.139 mi (93.566 km) | |||
| Existed: | 1976 – present | |||
| Major junctions | ||||
| West end: |
 US 50 near Middlegate
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| East end: |
US 50 near Austin
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State Route 722 (SR 722) is a state highway in Churchill County and Lander County in the U.S. state of Nevada. The highway is an old routing of U.S. Route 50 (US 50), and previously the Lincoln Highway. What is now route 722 crosses the Desatoya Mountains via Carroll Summit. The US 50 designation was removed from this alignment in favor of the modern route that traverses the Desatoya Mountains via New Pass Summit, which is 1,100 feet (340 m) lower and with an easier approach on both sides than Carroll Summit.
SR 722 deviates from US 50 near the roadhouse at Middlegate. It then crosses 2 summits, Eastgate at 5,110 feet (1,558 m), and Carroll Summit at 7,492 feet (2,284 m). There is a small settlement at Eastgate. On the west approach to Carroll is an old, unmaintained rest area. The highway then traverses a long desert valley named Smith Creek Valley and another summit, Railroad Pass at 6,431 feet (1,960 m), before entering the Reese River valley where the highway reunites with US 50 just west of Austin.
As a dirt road, the routing of the Lincoln Highway across Nevada changed several times. The original route of the Pony Express, from which the Nevada portion of the Lincoln Highway was based, crossed the Desatoya range at Basque Summit, at 7,452 feet (2,271 m). The route used an alignment that is now a dirt road called "Old Overland Road". At one time, the Lincoln Highway was routed on a route similar to the modern US 50 between Middlegate and Austin via New Pass.
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