On September 6, 2003, about 1400 Alaska daylight time, a wheel-equipped Cessna 150 airplane, N6767F, received substantial damage when it overran the runway and collided with trees during takeoff from a remote mining airstrip, about 50 miles south of Tanana, Alaska. The solo commercial pilot was not injured. The Title 14, CFR Part 91 personal flight operated in visual meteorological conditions without a flight plan. The flight was originating at the time of the accident, and was en route to Fairbanks, Alaska. During a telephone conversation with the National Transportation Safety Board investigator-in-charge on September 22, the pilot related that he was taking off to the west from his private grass/turf airstrip. He said the airstrip is approximately 1,400 feet long, and 100 feet wide. While the airplane was accelerating during the takeoff roll, the pilot said the main landing gear wheels encountered a muddy section of the runway, which slowed the airplane. He said the airplane became airborne near the end of the runway, but then settled onto the runway, and ran off the end and into trees. The airplane sustained structural damage to the wings and fuselage. The pilot said that there were no preimpact mechanical problems with the airplane.