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Blackburn Point Road Bridge

Blackburn Point Road Bridge

Primary Photographer(s): Nathan Holth, Rick McOmber, and Susie Babcock

Bridge Documented: March 23, 2010, March 6, 2017, and January 28, 2021

View Photos
and Videos
View Maps
and Links

Key Facts

Facility Carried / Feature Intersected
Blackburn Point Road (CR-789) Over Intracoastal Waterway
Location
Osprey: Sarasota County, Florida: United States
Construction Date and Builder / Engineer
1925 By Builder/Contractor: Champion Bridge Company of Wilmington, Ohio

Technical Facts

Rehabilitation Date
1995
Main Span Length
142 Feet (43.3 Meters)
Structure Length
142 Feet (43.3 Meters)
Roadway Width
15.7 Feet (4.79 Meters)
Spans
1 Main Span(s)
NBI Number
170064

Historic Significance Rating (HSR)
View Information About HSR Ratings

Bridge Documentation

This bridge is one of a small number of surviving swing truss bridges in Florida. Among this small number there is considerable variety, but a few of them appear to share the same standard plan. The Blackburn Point Road Bridge is an example of that standard plan. The design consists of trusses with rolled i-beams for the top chord and end post. Diagonal and vertical members are all built-up beams composed of two angles and battens. There is no v-lacing or lattice on any built-up beams.

The Blackburn Point Road Bridge in particular has an unusual detail that was observed. All the shop rivets (those rivets placed before the bridge parts were shipped to the site) have cone-shaped rivet heads. This design is nearly unheard of in bridge truss construction, although these rivets were used in boiler and tank construction as well as occasionally in caisson construction. In contrast, those rivets on the bridge placed in the field (during on-site assembly) are the standard round-head rivets.

This swing bridge still operates for boats.

The bridge has been rehabilitated, and some rivets were replaced with bolts and there are other welded repairs and alterations present. Otherwise however, the bridge retains its original appearance and design. Florida has an extremely small number of historic metal truss bridges. The preservation of each surviving example must be considered essential.

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

View Historic Bridge Inventory Sheet For This Bridge

View National Register of Historic Places Nomination Form For This Bridge

Above: Bridge in open position.

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Photo Galleries and Videos: Blackburn Point Road Bridge

 
View Photo Gallery
2021 Bridge Photo-Documentation
Original / Full Size Photos
A collection of overview and detail photos. This gallery offers photos in the highest available resolution and file size in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Photo Gallery
2021 Bridge Photo-Documentation
Mobile Optimized Photos
A collection of overview and detail photos. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Photo Gallery
2010 Bridge Photo-Documentation
Original / Full Size Photos
A collection of overview and detail photos. This gallery offers photos in the highest available resolution and file size in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Photo Gallery
2010 Bridge Photo-Documentation
Mobile Optimized Photos
A collection of overview and detail photos. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Video
Bridge Being Opened
Full Motion Video
Streaming video of the bridge. Also includes a higher quality downloadable video for greater clarity or offline viewing.
View Video
Bridge Being Closed
Full Motion Video
Streaming video of the bridge. Also includes a higher quality downloadable video for greater clarity or offline viewing.

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Maps and Links: Blackburn Point Road Bridge

Coordinates (Latitude, Longitude):

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USGS National Map (United States Only)

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