Nevada State Route 400
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| State Route 400 |
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| Unionville Road | |||||||||||||
| Length: | 16.56 mi[1] (26.65 km) | ||||||||||||
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| Formed: | 1976 renumbering (by 1935 as SR 50) | ||||||||||||
| South end: | Kyle Hot Springs Road | ||||||||||||
| North end: |   I-80/US 95 at Mill City |
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State Route 400 is a state highway in the U.S. state of Nevada. It runs from exit 149 (Mill City) on Interstate 80/U.S. Route 95, south along Unionville Road, to the intersection with Kyle Hot Springs Road east of Unionville.
Before the 1976 renumbering, SR 400 was State Route 50. SR 50, designated by 1935,[2] continued south and west on the unpaved Lovelock-Unionville Road to exit 119 (Oreana) on I-80/US 95.[3] The westernmost half mile (1 km) of this, between I-80 and old U.S. Route 40, is now State Route 858; the rest is no longer a state highway.[1] The SR 858 section was added ca. 1961[4] when I-80 was built to the west of old US 40.
