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Hoffman Swing Bridge

Ramsey County, Minnesota, and Dakota County, Minnesota
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Photos 

Photo taken by Nick Benson

View this photo on Flickr

Map 

Facts 

Overview
Warren through truss bridge over Mississippi River on Union Pacific Railroad
Location
St. Paul, Ramsey County, Minnesota, and Dakota County, Minnesota
Status
Open to traffic
History
Built 1910 for Chicago Great Western
Design
Warren through truss center pivot swing span with pratt truss and deck plate girder approaches.
Dimensions
Length of largest span: 400.0 ft.
Total length: 1,275.0 ft.
Also called
Chicago Great Western Bridge
Approximate latitude, longitude
+44.91883, -93.05013   (decimal degrees)
44°55'08" N, 93°03'00" W   (degrees°minutes'seconds")
Approximate UTM coordinates
15/496043/4973934 (zone/easting/northing)
Inventory number
BH 53749 (Bridgehunter.com ID)

Categories 

7-panel truss (247)
A-frame portal (232)
Built 1910 (741)
Built during 1910s (6,730)
Chicago & North Western Railway (470)
Chicago Great Western Railway (87)
Dakota County, Minnesota (15)
Deck girder (1,802)
Girder (3,239)
Minnesota (916)
Mississippi River (155)
Movable (1,355)
Navigable waterway (1,448)
Open (28,314)
Owned by railroad (4,046)
 Plate girder (2,251)
Pratt through truss (3,166)
Pratt truss (5,660)
Railroad (4,075)
Ramsey County, Minnesota (37)
Riveted (1,011)
Span length 250-500 feet (863)
St. Paul, Minnesota (25)
Swing (534)
Through truss (9,210)
Total length 1000-2500 feet (1,217)
Truss (23,574)
Union Pacific Railroad (793)
Warren through truss (927)
Warren truss (3,961)

Update Log 

  • October 9, 2012: Photo imported by Luke Harden
  • October 4, 2012: New photos from John Marvig
  • October 3, 2012: Photo imported by Luke Harden
  • October 3, 2012: Added by John Marvig

Sources 

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Comments 

Hoffman Swing Bridge
Posted March 31, 2013, by John Marvig (johnmarvig [at] chaska [dot] net)

The Swing Span does look newer. Never noticed that before.

The span was not likely renovated in 1982, as a lift span would have likely been put in instead. So I cannot say when it was renovated. The historic aerial photos of the area are poor quality.

Wikipedia gives the dates of rehabilitation of 1925, 1951 and 1982. I would put my money on the last date though. It is odd, especially for this area, that a bridge built in 1910 wouldn't last until this date.

Odd case.

Hoffman Swing Bridge
Posted March 30, 2013, by Nathan Holth (form3 [at] historicbridges [dot] org)

The approach spans may date to 1910, but the main swing span is clearly new. Anyone know the exact year? John Week's website says work was done many times, most recently in 1982, but I am not sure what date the swing span was replaced.