U.S. Nuclear Testing Program in the Marshall Islands |
During the period from June 30, 1946, to August 18, 1958, the United States conducted 67 nuclear tests in the Marshall Islands, all of which were considered atmospheric. The most powerful of those tests was the "Bravo" shot, a 15 megaton device detonated on March 1, 1954, at Bikini atoll. That test alone was equivalent to 1,000 Hiroshima bombs.
The tables below show the U.S. Nuclear Detonations in the Marshall Islands arranged testing series. Unless indicated otherwise, stated purpose of all tests was "Weapons Related")
No. | Date (M/D/Y) | Name | Atoll | Type | Yield |
1 | 6/30/46 | Able | Bikini | B-29 Airdrop (520 ft.) | 23 kilotons |
2 | 7/24/46 | Baker | Bikini | Underwater (-90 ft.) | 23 kilotons |
No. | Date (M/D/Y) | Name | Atoll | Type | Yield |
3 | 4/14/48 | X-Ray | Enewetak | Tower (200 ft.) | 37 kilotons |
4 | 4/30/48 | Yoke | Enewetak | Tower (200 ft.) | 49 kilotons |
5 | 5/14/48 | Zebra | Enewetak | Tower (200 ft.) | 18 kilotons |
No. | Date (M/D/Y) | Name | Atoll | Type | Yield |
6 | 4/7/51 | Dog | Enewetak | Tower (300 ft.) | 81 kilotons |
7 | 4/20/51 | Easy | Enewetak | Tower (300 ft.) | 47 kilotons |
8 | 5/8/51 | George | Enewetak | Tower (200 ft.) | 225 kilotons |
9 | 5/24/51 | Item | Enewetak | Tower (200 ft.) | 45.5 kilotons |
No. | Date (M/D/Y) | Name | Atoll | Type | Yield |
10 | 10/31/52 | Mike (1) | Enewetak | Surface | 10.4 megatons |
11 | 11/15/52 | King | Enewetak | Airdrop | 500 kilotons |
No. | Date (M/D/Y) | Name | Atoll | Type | Yield |
12 | 2/28/54 | Bravo (2) | Bikini | Surface | 15 megatons |
13 | 3/26/54 | Romeo | Bikini | Barge | 11 megatons |
14 | 4/6/54 | Koon | Bikini | Surface | 110 kilotons |
15 | 4/25/54 | Union | Bikini | Barge | 6.9 megatons |
16 | 5/4/54 | Yankee | Bikini | Barge | 13.5 megatons |
17 | 5/13/54 | Nectar | Bikini | Barge | 1.69 megatons |
No. | Date (M/D/Y) | Name | Atoll | Type | Yield |
18 | 5/4/56 | Lacrosse | Enewetak | Surface | 40 kilotons |
19 | 5/20/56 | Cherokee | Bikini | Airdrop | 3.8 megatons |
20 | 5/27/56 | Zuni | Bikini | Surface | 3.5 megatons |
21 | 5/27/56 | Yuma | Enewetak | Tower (205 ft.) | .19 kilotons |
22 | 5/30/56 | Erie | Enewetak | Tower (300 ft.) | 14.9 kilotons |
23 | 6/6/56 | Seminole | Enewetak | Surface | 13.7 kilotons |
24 | 6/11/56 | Flathead | Bikini | Barge | 365 kilotons |
25 | 6/11/56 | Blackfoot | Enewetak | Tower (200 ft.) | 8 kilotons |
26 | 6/13/56 | Kickapoo | Enewetak | Tower (300 ft.) | 1.49 kilotons |
27 | 6/16/56 | Osage | Enewetak | Airdrop (600-700 ft.) | 1.7 kilotons |
28 | 6/21/56 | Inca | Enewetak | Tower (200 ft.) | 15.2 kilotons |
29 | 6/25/56 | Dakota | Bikini | Barge | 1.1 megaton |
30 | 7/2/56 | Mohawk | Enewetak | Tower (300 ft.) | 360 kilotons |
31 | 7/8/56 | Apache | Enewetak | Barge | 1.85 megatons |
32 | 7/10/56 | Navajo | Bikini | Barge | 4.5 megatons |
33 | 7/20/56 | Tewa | Bikini | Barge | 5 megatons |
34 | 7/21/56 | Huron | Enewetak | Barge | 250 kilotons |
No. | Date (M/D/Y) | Name | Atoll | Type | Yield |
35 | 4/28/58 | Yucca | Near Enewetak (3) | Balloon (86,000 ft.) | 1.7 kilotons |
36 | 5/5/58 | Cactus | Enewetak | Surface | 18 kilotons |
37 | 5/11/58 | Fir | Bikini | Barge | 1.36 megatons |
38 | 5/11/58 | Butternut | Enewetak | Barge | 81 kilotons |
39 | 5/12/58 | Koa | Enewetak | Surface | 1.37 megatons |
40 | 5/16/58 | Wahoo | Enewetak | Underwater (-500 ft.) | 9 kilotons |
41 | 5/20/58 | Holly | Enewetak | Barge | 5.9 kilotons |
42 | 5/21/58 | Nutmeg | Bikini | Barge | 25.1 kilotons |
43 | 5/26/58 | Yellowwood | Enewetak | Barge | 330 kilotons |
44 | 5/26/58 | Magnolia | Enewetak | Barge | 57 kilotons |
45 | 5/30/58 | Tobacco | Enewetak | Barge | 11.6 kilotons |
46 | 5/31/58 | Sycamore | Bikini | Barge | 92 kilotons |
47 | 6/2/58 | Rose | Enewetak | Barge | 15 kilotons |
48 | 6/8/58 | Umbrella | Enewetak | Underwater (-150 ft.) | 8 kilotons |
49 | 6/10/58 | Maple | Bikini | Barge | 213 kilotons |
50 | 6/14/58 | Aspen | Bikini | Barge | 319 kilotons |
51 | 6/14/58 | Walnut | Enewetak | Barge | 1.45 megatons |
52 | 6/18/58 | Linden | Enewetak | Barge | 11 kilotons |
53 | 6/27/58 | Redwood | Bikini | Barge | 412 kilotons |
54 | 6/27/58 | Elder | Enewetak | Barge | 880 kilotons |
55 | 6/28/58 | Oak | Enewetak | Barge | 8.9 megatons |
56 | 6/29/58 | Hickory | Bikini | Barge | 14 kilotons |
57 | 7/1/58 | Sequoia | Enewetak | Barge | 5.2 kilotons |
58 | 7/2/58 | Cedar | Bikini | Barge | 220 kilotons |
59 | 7/5/58 | Dogwood | Enewetak | Barge | 397 kilotons |
60 | 7/12/58 | Poplar | Bikini | Barge | 9.3 megatons |
61 | 7/14/58 | Scaevola (4) | Enewetak | Barge | 0 |
62 | 7/17/58 | Pisonia | Enewetak | Barge | 255 kilotons |
63 | 7/22/58 | Juniper | Bikini | Barge | 65 kilotons |
64 | 7/22/58 | Olive | Enewetak | Barge | 202 kilotons |
65 | 7/26/58 | Pine | Enewetak | Barge | 2 megatons |
66 | 8/6/58 | Quince | Enewetak | Surface | 0 ("fizzle") |
67 | 8/18/58 | Fig | Enewetak | Surface | 0.02 |
Notes:
(1) Experimental thermonuclear device, produced a crater 6,240
feet in diameter and 164 feet deep. Device itself weighed 164,000
lbs.
(2) Largest nuclear test explosion conducted by the United States,
produced a crater 6,000 feet in diameter and 240 feet deep. Expected
yield 6 megatons (presumed range 4 to 8 megatons). Cloud top 114,000
feet.
(3) Balloon detonation at 12°37' N, 169°01' E, approximately
85 miles northeast of Enewetak.
(4) "Safety experiment."
Addendum to "Compilation of Local Fallout Data From Test Detonations 1945-1962 Extracted From DASA 1251" Volume II - Oceanic U.S. Tests, 1 May 1979, prepared by General Electric Company-TEMPO under contract to the Defense Nuclear Agency.
"Nuclear Weapons Databook Working Papers - Known U.S. Nuclear Tests" January 1989, published by Natural Resources Defense Council.
U.S. Department of Energy "List of Declassified Yields of Tests Conducted in the Pacific Prior to 1958-1961 Moratorium, December 1993."
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