“1973 underground nuclear test site”
Project Rio Blanco was an underground nuclear test that took place on May 17, 1973 in Rio Blanco County, Colorado, approximately 58 km northwest of Rifle. Three 33-kiloton nuclear devices were detonated nearly simultaneously in a single emplacement well at depths of 5,838, 6,230, and 6,689 feet below ground level. The tests were conducted in fine-grain, low-permeability sandstone lenses at the base of the Fort Union Formation and the upper portion of the Mesaverde Formation. This was the third and final natural-gas-reservoir stimulation test in the Plowshare program, which was designed to develop peaceful uses for nuclear energy. The two previous tests were Project Gasbuggy in New Mexico and Project Rulison in Colorado. The United States Atomic Energy Commission conducted the test in partnership with CER Geonuclear Corporation and Continental Oil Company. A placard, erected in 1976, now marks the site where the test was conducted. The site is accessible via a dirt road, Rio Blanco County Route 29.
Project Rio Blanco took place in 1973, when THREE 33-kiloton nuclear devises were simultaneous detonated 5-6,000 feet underground.
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Project Rio Blanco Test Site
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