The accident occurred in eastern Madera County, California. According to the January 15 edition of the Fresno Bee, two federal law enforcement agents near the confluence of Willow Creek and the San Joaquin River witnessed the devastating helicopter accident just after noon on January 5. The agents told investigators that they saw the helicopter emerge from a valley to the north and fly south along Willow Creek in their direction.
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The crash took the lives of pilot Dennis Donovan, 70, of Palm Springs, as well as Fish and Game employees Clu Cotter, 48, an associate biologist; biologist supervisor Kevin O'Connor, 40; and Tom Stolberg, 31, a scientific aide.
Weather conditions were reported to be clear and eyewitnesses reported that the helicopter did not appear to be malfunctioning at the time of the accident.
Investigators released a preliminary report on January 15, ten days after the helicopter accident. It is not known if the collision between the primary rotor blade and the static line—if that, indeed, is proven to be the case—had any bearing on the helicopter crash.