On April 30, 2004, about 1200 eastern daylight time, a Cessna 305A, N2070E, was substantially damaged while landing at the Taunton Municipal Airport (TAN), Taunton, Massachusetts. The certificated private pilot received minor injuries. Visual meteorological conditions prevailed and no flight plan had been filed for the personal flight conducted under 14 CFR part 91. The pilot was attempting to land on a grass area adjacent to runway 30, a 3500-foot-long, 75-foot-wide, asphalt runway. In a written statement, the pilot stated that upon touchdown on the grass, the landing gear sank into the soft ground and the airplane nosed over. Examination to the airplane revealed damage to the propeller and landing gear. The pilot stated that he did not check the condition of the grass area prior to landing. The pilot reported 3,050 hours of total flight experience, which included 450 hours in the same make and model of the accident airplane. Winds reported at Taunton, at 1152, were from 210 degrees at 11 knots.