English: The Knights Ferry covered bridge on the Stanislaus River in Stanislaus County, California, USA. The bridge is located in the Knights Ferry Recreation Area, approximately 11 miles (18 km) east-northeast of Oakdale, California. The bridge was constructed in 1864 to replace a ferry established in 1848 by Dr. William Knight. The bridge was weakened by an overweight truck and closed to vehicular traffic in 1981. Restored by the U.S. Army Corps of Engineers, it was incorporated into the recreation area. The bridge is 330 feet (100 m) long and is the longest covered bridge west of the Mississippi River. The bridge is a National Historic Landmark on the National Register of Historic Places.