Lower Blackburn Grade Bridge

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Lower Blackburn Grade Bridge
Lower Blackburn Grade Bridge is located in California
Lower Blackburn Grade Bridge
Location California State Route 36 outside Bridgeville, California
Coordinates 40°28′50″N 123°53′22″W / 40.48056°N 123.88944°W / 40.48056; -123.88944Coordinates: 40°28′50″N 123°53′22″W / 40.48056°N 123.88944°W / 40.48056; -123.88944
Built 1925
Architect John B. Leonard
Architectural style Through arch bridge
NRHP Reference # 81000148[1]
Added to NRHP 25 June 1981

The Lower Blackburn Grade Bridge, also named the Van Duzen River Bridge or Mile 18 Bridge, is a 258-foot-long (79 m) reinforced concrete through arch with a main span approximately 150 feet (46 m) over the Van Duzen River about 4 miles (6.4 km) west of Bridgeville, California, United States. It was active from its construction in 1925 to 1985 when replaced.

The bridge has inset panels along the ornate concrete through arch and an architectural rail and is the only reinforced concrete through arch built along the Van Duzen River Highway.[2] It is one of five bridges on the Fortuna to Red Bluff route on California State Route 36 designed by architect John B. Leonard in the years 1923 to 1925.[2] The bridge was built by Humboldt County in 1925 to replace the steep grades and dangerous curves of the Blackburn Grade and a covered bridge at Bridgeville.[2] The bridge was added to the National Register of Historic Places on 25 June 1981.[1]

The bridge was bypassed and abandoned for vehicle traffic in 1985 when a reinforced concrete box girder bridge replaced the older bridge.[2] The new bridge is named after Italian immigrant Silvio "Botchie" Santi.[3]

See also[edit]


  1. ^ a b National Park Service (March 13, 2009). "National Register Information System". National Register of Historic Places. National Park Service. Retrieved 15 February 2013. 
  2. ^ a b c d Snyder, John W. (21 January 1981). "Van Duzen River Bridge, Nomination Form" (PDF). National Register of Historic Places Inventory. National Park Service. Retrieved 15 February 2013. 
  3. ^ 2011 Named Freeways, Highways, Structures and Other Appurtenances in California (PDF). CALTRANS. January 2012. Retrieved 17 February 2013.