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See also: List of nuclear weapons tests of the United States
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Cresset
Information
Country United States
Period 1977–1978
Number of tests 22
Test type underground shaft, tunnel
Max. yield 150 kilotonnes of TNT (630 TJ)

The United States's Cresset nuclear test series was a group of 22 nuclear tests conducted in 1977–1978. These tests followed the Operation Fulcrum series and preceded the Operation Quicksilver series.

United States' Cresset series tests and detonations
Name Date time (UT) Local time zone Location Elevation + height Delivery
Purpose		 Device Yield Fallout References Notes
Bobstay October 26, 1977 14:15:00.08 PST (–8 hrs)
 NTS Area U3jb 37°00′27″N 116°01′03″W / 37.00759°N 116.01741°W / 37.00759; -116.01741 (Bobstay) 1,180 m (3,870 ft) – 381.3 m (1,251 ft) underground shaft,
weapons development		 5 kt I-131 venting detected, 0.000003 Ci (0.00011 GBq)
Hybla Gold November 1, 1977 18:06:00.07 PST (–8 hrs)
 NTS Area U12e.20 37°11′16″N 116°12′50″W / 37.18773°N 116.21384°W / 37.18773; -116.21384 (Hybla Gold) 2,239 m (7,346 ft) – 384.99 m (1,263.1 ft) tunnel,
weapon effect		 10 kt I-131 venting detected, 0 Shot to test the MX missile shallow buried trench basing concept to see if a nearby nuclear fireball would cause the trench to act as a shock tube.
Sandreef November 9, 1977 22:00:00.075 PST (–8 hrs)
 NTS Area U7aq 37°04′20″N 116°03′04″W / 37.07217°N 116.05115°W / 37.07217; -116.05115 (Sandreef) 1,221 m (4,006 ft) – 700.74 m (2,299.0 ft) underground shaft,
weapons development		 150 kt
Seamount November 17, 1977 19:30:00.077 PST (–8 hrs)
 NTS Area U3kp 37°01′14″N 116°01′33″W / 37.02055°N 116.02584°W / 37.02055; -116.02584 (Seamount) 1,186 m (3,891 ft) - 370.09 m (1,214.2 ft) underground shaft,
weapons development		 10 kt
Rib December 14, 1977 15:00:00.17 PST (–8 hrs)
 NTS Area U3jv 37°01′03″N 116°01′07″W / 37.01752°N 116.01864°W / 37.01752; -116.01864 (Rib) 1,184 m (3,885 ft) – 212.84 m (698.3 ft) underground shaft,
weapons development		 800 t
Farallones December 14, 1977 15:30:00.07 PST (–8 hrs)
 NTS Area U3fa 37°08′09″N 116°05′12″W / 37.13573°N 116.08658°W / 37.13573; -116.08658 (Farallones) 1,290 m (4,230 ft) – 668 m (2,192 ft) underground shaft,
weapons development		 150 kt Venting detected, 1 Ci (37 GBq)
Campos February 13, 1978 21:53:00.162 PST (–8 hrs)
 NTS Area U9cp 37°07′34″N 116°01′57″W / 37.12607°N 116.03261°W / 37.12607; -116.03261 (Campos) 1,269 m (4,163 ft) – 319.6 m (1,049 ft) underground shaft,
weapons development		 800 t Venting detected, 1.3 kCi (48 TBq)
Reblochon February 23, 1978 17:00:00.164 PST (–8 hrs)
 NTS Area U2en 37°07′25″N 116°03′53″W / 37.12363°N 116.0647°W / 37.12363; -116.0647 (Reblochon) 1,261 m (4,137 ft) – 658.4 m (2,160 ft) underground shaft,
weapons development		 120 kt Venting detected, 36 Ci (1,300 GBq)
Karab March 16, 1978 15:00:00.07 PST (–8 hrs)
 NTS Area U4ah 37°05′06″N 116°04′57″W / 37.08512°N 116.08249°W / 37.08512; -116.08249 (Karab) 1,247 m (4,091 ft) – 331 m (1,086 ft) underground shaft,
weapons development		 1.5 kt Venting detected
Iceberg March 23, 1978 16:30:00.2 PST (–8 hrs)
 NTS Area U4g 37°06′07″N 116°03′08″W / 37.10182°N 116.05236°W / 37.10182; -116.05236 (Iceberg) 1,239 m (4,065 ft) – 640.29 m (2,100.7 ft) underground shaft,
weapons development		 120 kt
Topmast March 23, 1978 16:30:00.114 PST (–8 hrs)
 NTS Area U7ay 37°05′56″N 116°01′14″W / 37.09881°N 116.02049°W / 37.09881; -116.02049 (Topmast) 1,282 m (4,206 ft) – 457.81 m (1,502.0 ft) underground shaft,
weapons development		 less than 20 kt
Backbeach April 11, 1978 17:45:00.073 PST (–8 hrs)
 NTS Area U19x 37°14′00″N 116°22′10″W / 37.23344°N 116.36936°W / 37.23344; -116.36936 (Backbeach) 2,040 m (6,690 ft) – 671.78 m (2,204.0 ft) underground shaft,
weapons development		 100 kt
Asco April 25, 1978 14:35:00.162 PST (–8 hrs)
 NTS Area U10bc 37°09′16″N 116°02′08″W / 37.15452°N 116.03563°W / 37.15452; -116.03563 (Asco) 1,285 m (4,216 ft) – 183 m (600 ft) underground shaft,
safety experiment		 less than 20 kt
Transom May 10, 1978 15:00:00.07 PST (–8 hrs)
 NTS Area U4f 37°05′16″N 116°03′13″W / 37.08773°N 116.0535°W / 37.08773; -116.0535 (Transom) 1,231 m (4,039 ft) – 640 m (2,100 ft) underground shaft,
weapons development		 no yield Fizzle? Device destroyed by Quicksilver/Hearts detonation on 1979.
Jackpots June 1, 1978 17:00:00.075 PST (–8 hrs)
 NTS Area U3kj 37°01′14″N 116°01′58″W / 37.02062°N 116.03267°W / 37.02062; -116.03267 (Jackpots) 1,186 m (3,891 ft) – 304.22 m (998.1 ft) underground shaft,
weapons development		 600 t
Satz July 7, 1978 14:00:00.167 PST (–8 hrs)
 NTS Area U2dq 37°06′43″N 116°04′41″W / 37.11185°N 116.07796°W / 37.11185; -116.07796 (Satz) 1,263 m (4,144 ft) – 315 m (1,033 ft) underground shaft,
weapons development		 1.5 kt Venting detected
Lowball July 12, 1978 17:00:00.08 PST (–8 hrs)
 NTS Area U7av 37°04′43″N 116°02′42″W / 37.07861°N 116.04493°W / 37.07861; -116.04493 (Lowball) 1,225 m (4,019 ft) – 564.88 m (1,853.3 ft) underground shaft,
weapons development		 99 kt
Panir August 31, 1978 14:00:00.164 PST (–8 hrs)
 NTS Area U19ys 37°16′33″N 116°21′30″W / 37.27587°N 116.35823°W / 37.27587; -116.35823 (Panir) 2,013 m (6,604 ft) – 681 m (2,234 ft) underground shaft,
weapons development		 140 kt
Diablo Hawk September 13, 1978 15:15:00.16 PST (–8 hrs)
 NTS Area U12n.10a 37°12′32″N 116°12′42″W / 37.20875°N 116.21165°W / 37.20875; -116.21165 (Diablo Hawk) 2,212 m (7,257 ft) – 388 m (1,273 ft) tunnel,
weapon effect		 Weapon effect on W87 warhead 8 kt
Cremino - 1 September 27, 1978 16:30:00.165 PST (–8 hrs)
 NTS Area U8e 37°10′15″N 116°05′17″W / 37.17096°N 116.08804°W / 37.17096; -116.08804 (Cremino - 1) 1,341 m (4,400 ft) – 210 m (690 ft) underground shaft,
weapons development		 250 t Simultaneous, same hole.
Cremino-Caerphilly - 2 September 27, 1978 16:30:00.17 PST (–8 hrs)
 NTS Area U8e 37°10′15″N 116°05′17″W / 37.17096°N 116.08804°W / 37.17096; -116.08804 (Cremino-Caerphilly - 2) 1,341 m (4,400 ft) + underground shaft,
weapons development		 less than 20 kt Simultaneous, same hole.
Draughts September 27, 1978 17:00:00.071 PST (–8 hrs)
 NTS Area U7al 37°04′26″N 116°01′15″W / 37.07382°N 116.0207°W / 37.07382; -116.0207 (Draughts) 1,234 m (4,049 ft) – 441.59 m (1,448.8 ft) underground shaft,
weapons development		 25 kt
Rummy September 27, 1978 17:20:00.076 PST (–8 hrs)
 NTS Area U7au 37°04′47″N 116°03′09″W / 37.07974°N 116.05253°W / 37.07974; -116.05253 (Rummy) 1,226 m (4,022 ft) – 639.78 m (2,099.0 ft) underground shaft,
weapons development		 150 kt
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