On September 8, 2001, about 1500 Pacific daylight time, a Cessna 172M, N20675, sustained substantial damage after taxiing into a temporary construction fence at Boeing Field/ King County International Airport, Seattle, Washington. The airplane is registered to the pilot, and was being operated as a visual flight rules (VFR) personal 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 provisions prevailed. The pilot submitted a written report to the NTSB dated September 27, and reported that shortly after landing, he was cleared to taxi the airplane to the northeast parking area via taxiway Alpha. He reported that while traveling northbound on the taxiway he encountered an airplane that was traveling southbound on the same taxiway. In an effort to avoid the oncoming (southbound) airplane, he maneuvered the airplane to the easterly edge of the taxiway and inadvertently collided with the temporary construction fence.