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See also: List of nuclear weapons tests of the United States
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Fulcrum
Information
Country United States
Period 1976–1977
Number of tests 21
Test type underground shaft
Max. yield 140 kilotonnes of TNT (590 TJ)

The United States's Fulcrum nuclear test series was a group of 21 nuclear tests conducted in 1976–1977. These tests followed the Operation Anvil (Nuclear test) series and preceded the Operation Cresset series.

United States' Fulcrum series tests and detonations
Name Date time (UT) Local time zone Location Elevation + height Delivery
Purpose		 Device Yield Fallout References Notes
Gouda October 6, 1976 14:30:00.164 PST (–8 hrs)
 NTS Area U2ef 37°08′04″N 116°03′47″W / 37.13451°N 116.06315°W / 37.13451; -116.06315 (Gouda) 1,272 m (4,173 ft) – 200.1 m (656 ft) underground shaft,
weapons development		 600 t
Sprit November 10, 1976 14:58:00.077 PST (–8 hrs)
 NTS Area U3hc 37°02′09″N 116°01′05″W / 37.03593°N 116.01816°W / 37.03593; -116.01816 (Sprit) 1,192 m (3,911 ft) – 183.18 m (601.0 ft) underground shaft,
weapons development		 less than 20 kt
Chevre November 23, 1976 15:15:00.163 PST (–8 hrs)
 NTS Area U10ay 37°10′18″N 116°03′13″W / 37.17167°N 116.0535°W / 37.17167; -116.0535 (Chevre) 1,278 m (4,193 ft) – 317.3 m (1,041 ft) underground shaft,
weapons development		 2 kt
Redmud December 8, 1976 14:49:30.083 PST (–8 hrs)
 NTS Area U7ab 37°04′45″N 116°00′09″W / 37.07922°N 116.00249°W / 37.07922; -116.00249 (Redmud) 1,269 m (4,163 ft) – 426.72 m (1,400.0 ft) underground shaft,
weapons development		 20 kt
Asiago December 21, 1976 15:09:00.166 PST (–8 hrs)
 NTS Area U2ar 37°07′26″N 116°04′06″W / 37.12386°N 116.06833°W / 37.12386; -116.06833 (Asiago) 1,265 m (4,150 ft) – 330.8 m (1,085 ft) underground shaft,
weapons development		 11 kt
Sutter December 21, 1976 15:58:00.162 PST (–8 hrs)
 NTS Area U2bw 37°09′07″N 116°03′52″W / 37.15205°N 116.06454°W / 37.15205; -116.06454 (Sutter) 1,287 m (4,222 ft) – 200.3 m (657 ft) underground shaft,
weapons development		 less than 20 kt
Rudder December 28, 1976 18:00:00.076 PST (–8 hrs)
 NTS Area U7aj(s) 37°06′01″N 116°02′15″W / 37.1004°N 116.03755°W / 37.1004; -116.03755 (Rudder) 1,255 m (4,117 ft) – 638.56 m (2,095.0 ft) underground shaft,
weapons development		 89 kt
Cove - 1 (with Oarlock) February 16, 1977 17:53:00.16 PST (–8 hrs)
 NTS Area U3ki 37°00′24″N 116°01′56″W / 37.00662°N 116.0321°W / 37.00662; -116.0321 (Cove - 1) 1,181 m (3,875 ft) + underground shaft,
weapons development		 3 kt Simultaneous, separate holes.
Oarlock - 2 (with Cove) February 16, 1977 17:53:00.073 PST (–8 hrs)
 NTS Area U3km 37°00′48″N 116°01′46″W / 37.01346°N 116.02937°W / 37.01346; -116.02937 (Oarlock - 2) 1,183 m (3,881 ft) – 317.6 m (1,042 ft) underground shaft,
weapons development		 8 kt Simultaneous, separate holes.
Dofino - 1 March 8, 1977 14:24:00.164 PST (–8 hrs)
 NTS Area U10ba 37°10′34″N 116°03′14″W / 37.17616°N 116.05385°W / 37.17616; -116.05385 (Dofino - 1) 1,283 m (4,209 ft) – 182.88 m (600.0 ft) underground shaft,
weapons development		 800 t Venting detected, 25 Ci (920 GBq) Simultaneous, same hole.
Dofino-Lawton - 2 March 8, 1977 14:24:00.16 PST (–8 hrs)
 NTS Area U10ba 37°10′34″N 116°03′14″W / 37.17616°N 116.05385°W / 37.17616; -116.05385 (Dofino-Lawton - 2) 1,283 m (4,209 ft) – 282 m (925 ft) underground shaft,
weapons development		 less than 20 kt Venting detected Simultaneous, same hole.
Marsilly April 5, 1977 15:00:00.167 PST (–8 hrs)
 NTS Area U2ei 37°07′13″N 116°03′47″W / 37.12019°N 116.06315°W / 37.12019; -116.06315 (Marsilly) 1,259 m (4,131 ft) – 689.73 m (2,262.9 ft) underground shaft,
weapons development		 140 kt Venting detected, 15 Ci (560 GBq)
Bulkhead April 27, 1977 15:00:00.084 PST (–8 hrs)
 NTS Area U7am 37°05′41″N 116°01′44″W / 37.09474°N 116.02875°W / 37.09474; -116.02875 (Bulkhead) 1,259 m (4,131 ft) – 594.36 m (1,950.0 ft) underground shaft,
weapons development		 67 kt
Crewline May 25, 1977 17:00:00.076 PST (–8 hrs)
 NTS Area U7ap 37°05′39″N 116°02′45″W / 37.0943°N 116.04574°W / 37.0943; -116.04574 (Crewline) 1,237 m (4,058 ft) – 564.18 m (1,851.0 ft) underground shaft,
weapons development		 51 kt
Forefoot June 2, 1977 17:15:00.098 PST (–8 hrs)
 NTS Area U3kf 37°03′18″N 116°01′33″W / 37.0549°N 116.02583°W / 37.0549; -116.02583 (Forefoot) 1,207 m (3,960 ft) – 193.55 m (635.0 ft) underground shaft,
weapons development		 less than 20 kt
Carnelian July 28, 1977 14:07:00.162 PST (–8 hrs)
 NTS Area U4af 37°05′51″N 116°05′31″W / 37.09751°N 116.09182°W / 37.09751; -116.09182 (Carnelian) 1,265 m (4,150 ft) – 208 m (682 ft) underground shaft,
weapons development		 600 t Venting detected, 7 Ci (260 GBq)
Strake August 4, 1977 16:40:00.074 PST (–8 hrs)
 NTS Area U7ae 37°05′11″N 116°00′28″W / 37.08652°N 116.00774°W / 37.08652; -116.00774 (Strake) 1,273 m (4,177 ft) – 517.55 m (1,698.0 ft) underground shaft,
weapons development		 44 kt
Gruyere - 1 August 16, 1977 14:41:00.165 PST (–8 hrs)
 NTS Area U9cg 37°08′42″N 116°03′00″W / 37.14512°N 116.04996°W / 37.14512; -116.04996 (Gruyere - 1) 1,263 m (4,144 ft) – 206.96 m (679.0 ft) underground shaft,
weapons development		 less than 20 kt Simultaneous, same hole.
Gruyere-Gradino - 2 August 16, 1977 14:41:00.16 PST (–8 hrs)
 NTS Area U9cg 37°08′42″N 116°03′00″W / 37.14512°N 116.04996°W / 37.14512; -116.04996 (Gruyere-Gradino - 2) 1,263 m (4,144 ft) – 320 m (1,050 ft) underground shaft,
weapons development		 600 t Venting detected, 0.8 Ci (30 GBq) Simultaneous, same hole.
Flotost August 16, 1977 15:49:00.168 PST (–8 hrs)
 NTS Area U2ao 37°08′48″N 116°03′50″W / 37.14669°N 116.06402°W / 37.14669; -116.06402 (Flotost) 1,284 m (4,213 ft) – 274.93 m (902.0 ft) underground shaft,
weapons development		 1.5 kt Venting detected, 3 Ci (110 GBq)
Scupper August 19, 1977 17:32:00.098 PST (–8 hrs)
 NTS Area U3hj 37°01′03″N 116°01′57″W / 37.01757°N 116.03248°W / 37.01757; -116.03248 (Scupper) 1,185 m (3,888 ft) – 449.58 m (1,475.0 ft) underground shaft,
weapons development		 200 t
Scantling August 19, 1977 17:55:00.1 PST (–8 hrs)
 NTS Area U4h 37°06′36″N 116°03′20″W / 37.10997°N 116.05567°W / 37.10997; -116.05567 (Scantling) 1,246 m (4,088 ft) – 701.04 m (2,300.0 ft) underground shaft,
weapons development		 120 kt
Ebbtide September 15, 1977 14:36:30.077 PST (–8 hrs)
 NTS Area U3kt 37°01′58″N 116°02′38″W / 37.03274°N 116.044°W / 37.03274; -116.044 (Ebbtide) 1,194 m (3,917 ft) – 379.48 m (1,245.0 ft) underground shaft,
weapons development		 6 kt
Coulommiers September 27, 1977 14:00:00.161 PST (–8 hrs)
 NTS Area U2ei 37°09′04″N 116°04′06″W / 37.15112°N 116.06843°W / 37.15112; -116.06843 (Coulommiers) 1,292 m (4,239 ft) – 530.35 m (1,740.0 ft) underground shaft,
weapons development		 20 kt Venting detected, 0.9 Ci (33 GBq)
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