On November 11, 2005, approximately 2130 mountain standard time, a Cessna 182, N5715B, piloted by a private pilot, was substantially damaged during the landing roll at Jefferson County Airport (BJC), Broomfield, Colorado. Night visual meteorological conditions prevailed at the time of the accident. The personal flight was being conducted under the provisions of Title 14 CFR Part 91 without a flight plan. The private pilot and his 3 passengers reported no injuries. The local flight departed Centennial Airport (APA), Englewood, Colorado, approximately 2100. According to the pilot, the touchdown was soft and the airplane maintained centerline. The pilot reported that during the landing roll he applied brakes and the nose wheel began to "shimmy." He added backpressure to reduce the load on the nose and "as the air[plane] slowed to approximately 20 [to] 25 mph, the air[plane] nosed down into the runway. The nose wheel assembly folded under the airplane and the airplane came to rest on the cowling and engine. The firewall was wrinkled, the cowling crushed, and the nose landing gear assembly separated from the airplane. An examination of the nose landing gear and remaining airplane systems revealed no anomalies.