National Register of Historic Places in Nevada County
The Bridgeport Covered Bridge, a wooden bridge built by David X. Wood was part of the old turnpike which served Nevada City, North San Juan, and the Malakoff Mines. It is the only structure left reminiscent of Old Bridgeport - long since torn down.
The Bridgeport Covered Bridge is the longest covered bridge in the West and the longest single span covered bridge in the United States. (The length is somewhere between 233 and 251 feet depending upon the source.) The design combines a Howe truss with an auxiliary Burr arch which is visible from both the outside and the inside.
The Bridgeport Covered Bridge is also California Historical Landmark 390.
Historic Covered Bridges in California
Historic Covered Bridges in Oregon