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9. Nevada National Security Site (NNSS) ☢

Last modified: 24 Apr 2022

Country: United States    Region: Nevada

Locale: nuc testsite

Latitude: 37° 8' 57" N     Longitude: -117° 56' 16" E

Area use / Military Branches: Closed


Former Nevada Proving Grounds, then the Nevada Test Site (NTS) and then renamed Nevada National Security Site (NNSS)

NNSS is located in Nye County about 65 miles northwest of Las Vegas covering appx 1,375 square miles. Its location was preferred for a number of reasons: the facilities at the existing bombing range within which it would lie (landing strips, housing, etc) its proximity to Highway 95 for personnel access and the predictable weather. All in all 928 documented atmospheric and underground nuclear tests occurred at the Nevada Test Site.Between 1951-1992
Nuclear weapons tests occurred in 4 regions within the Test Site:
Frenchman Flat at grid 3649'49"N 11556'1"W Yucca Flat at grid 37 3'43"N 116 2'27"W
Rainier Mesa at grid 3712'32"N 11614'7"W and Pahute Mesa at grid 3713'24"N 11632'28"W

3 types of tests have been conducted:
weapons effects, weapons design and personnel operations testing involving military conducting operations near ground zero.
Other regions, such as Jackass Flats, were used for other nuclear-related testing but not for weapons tests.

Pressured by international concern about radioactive fallout, US government began to move tests underground. The majority of underground tests took place at Yucca Flat, Rainier Mesa and Pahute Mesa. Satellite photographs of Yucca Flat show the craters caused by these tests. The last underground test took place on September 23, 1992 A total of 1,032 nuclear tests have been carried out before site closure.
SIte closed and heavily radioactive contaminated.

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