On September 5, 1993, about 0840 hours Pacific daylight time, a Cameron V77 balloon, N2021A, operated by the pilot, was substantially damaged after colliding with a pine tree while maneuvering to land near the stampede reservoir. Neither the commercial balloon pilot nor his passenger was injured. Visual meteorological conditions prevailed for the personal flight. The origin point and time of the flight are undetermined. The pilot stated to an FAA inspector from the Reno Flight Standards District Office that at approximately 20 to 30 feet above the ground he encountered lift and acceleration to the east. The balloon then collided with a pine tree at about 60 feet in the air and ripped the envelope while gaining altitude. It then slid down the pine tree stopping about ten feet above the ground. The pilot also stated that 90 of the 144 panels of the balloon were damaged. An NTSB Form 6120.1/2, Pilot/Operator Aircraft Accident Report form, was sent by certified mail to the pilot. After three attempts to deliver the mail, it was returned by the Post Office as undeliverable.