| 词条 | Lower Blackburn Grade Bridge |
| 释义 |
|name= Lower Blackburn Grade Bridge |nrhp_type= |image= Lower Blackburn Grade Bridge.jpg |caption= |location= California State Route 36 outside Bridgeville, California |coordinates = {{coord|40|28|50|N|123|53|22|W|display=inline,title}} |locmapin= California |area= |built= 1925 |architect= John B. Leonard |architecture= Through arch bridge |added= 25 June 1981 |mpsub= |refnum=81000148[1] }} The Lower Blackburn Grade Bridge, also named the Van Duzen River Bridge or Mile 18 Bridge, is a {{convert|258|ft|m|adj=mid|-long}} reinforced concrete through arch with a main span approximately {{convert|150|ft|m}} over the Van Duzen River about {{convert|4|mi|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 was 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
References1. ^1 {{NRISref|2009a|dateform=mdy|accessdate= 15 February 2013}} 2. ^1 2 3 {{cite web |last= Snyder |first= John W. |title= Van Duzen River Bridge, Nomination Form |work= National Register of Historic Places Inventory |publisher= National Park Service |date= 21 January 1981 |url= {{NRHP url|id=81000148}} |format= PDF |accessdate= 15 February 2013 }} 3. ^{{cite book |title=2011 Named Freeways, Highways, Structures and Other Appurtenances in California |publisher= CALTRANS |date=January 2012 |url=http://www.dot.ca.gov/hq/tsip/hseb/products/Named_Freeways_Final.pdf |accessdate= 17 February 2013 }} 9 : Bridges in Humboldt County, California|Road bridges on the National Register of Historic Places in California|Bridges completed in 1925|Pedestrian bridges in California|National Register of Historic Places in Humboldt County, California|Road bridges in California|Former road bridges in the United States|Concrete bridges in California|Through arch bridges in the United States |
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