Duane Johnson, park manager for the U.S. Army Corps of Engineers Sacramento District’s Stanislaus River Parks (left), speaks about the historic Knights Ferry covered bridge in Knights Ferry, Calif., March 22, 2014, as contracting team leader, Lt. Col. Chris Tande and his son, Gerrit, look on. Sacramento District employees and hundreds of history buffs gathered in Knights Ferry to officially commemorate attaining National Historic Landmark status for the 300-foot-long covered bridge in the historic 19th-century township.