On February 1, 2003, about 1815 Pacific standard time, a Cessna 180B, N59180, sustained substantial damage while landing at the Klamath Falls International Airport, Klamath Falls, Oregon. The airplane is owned by the pilot, and was being operated as a visual flight rules (VFR) personal/pleasure cross-country flight under the provisions of Title 14 CFR, Part 91, when the accident occurred. The private pilot, the sole occupant of the airplane, was not injured. Visual meteorological conditions prevailed, and a flight plan had been activated for the cross-country flight that originated from Red Bluff, California. The pilot reported that he completed a go-around to runway 32 due to wind conditions. After the go-around, the pilot made a second approach and landed on runway 32. He reported that during the landing rollout, while retracting the flaps, the airplane's left wing "came up." The pilot reported that he tried to compensate with full control inputs, however, the airplane nosed-over resulting in substantial damage. At 1753, the official weather observation station located at the Klamath Falls Airport, reported winds from 290 degrees at 9 knots. No mechanical difficulties or malfunctions were reported.