On September 26, 2003, about 1330 mountain daylight time, a Cessna 180 H, N9707G, sustained substantial damage subsequent to a nose over while landing at a private airstrip near Council, Idaho. The airplane is owned by 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 commercial pilot and passenger were not injured. Visual meteorological conditions prevailed, and no flight plan was filed for the local flight. The flight originated from Caldwell, Idaho, approximately 35 minutes prior to the accident. In a written statement, the pilot reported that shortly after touchdown on runway 34, the airplane encountered a soft, water soaked area of the runway and nosed over. He reported that he was unaware of the fact that the area had recently been irrigated.