Difference between revisions of "Hansen 1919 Bridge"

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608 foot span / 185 meter span<br />
 
608 foot span / 185 meter span<br />
 
1919-1966<br />
 
1919-1966<br />
[[File:2HansenPostcard.jpg|1000px|center]]
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[[File:2HansenPostcard.jpg|750px|center]]
 
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Constructed in 1966 to replace an aging suspension bridge from 1919, the current Hansen bridge has 3 main steel girder spans set atop two of the highest piers ever built in the United States at 338 feet (103 mtrs).  The central span is 258 feet (79 mtrs) with two side spans of 200 feet (61 mtrs) and an approach span of 102 feet (31 mtrs).   
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The highest bridge in North America upon its completion in 1919, the Hansen suspension bridge had a main span of 608 feet (185 mtrs) and a pony truss side span of 80 feet (24 mtrs).  Engineer R. M. Murray enclosed the road deck within an extremely large stiffening truss 20 feet (6 mtrs) deep.  The truss was 17 feet (5 mtrs) wide between the centerline of the beams while the two main cables were 30 feet (9 mtrs) apart at the towersTo ensure the rigidity of the span, two large wind cables were located below the full length of the deck and anchored into rock on the rims of the gorgeThe north tower was the tallest of the two at 117 feet (36 mtrs).  Total cost: $100,000.
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A dirt parking area on the south side of the crossing offers a great view of the bridge and the precipitous Snake River CanyonIf you are visiting the Twin Falls area, also be sure to check out the famous 486 foot (148 mtr) high Perrine bridge, located about 8 miles (13 kms) downstream from the Hansen bridge.    
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With a road deck width of just 14 feet (4 mtrs), the bridge had been obsolete for years and in 1966 the old suspension span was replaced by a new steel girder Hansen bridge with two concrete piers that descend all the way to the bottom of the canyon.   
 
The original Hansen suspension bridge was the highest bridge in North America upon its completion in 1919.  Soon after the Hansen suspension bridge opened, its construction engineer R. M. Murray started to look into another crossing of the Snake River.  It took several more years before funding was available for the new bridge but once construction began in November of 1926, it was just under a year before the Twin Falls Jerome bridge was completed in time for the Jerome county fair in September of 1927The massive cantilever remained North America’s highest bridge for two years before the Royal Gorge suspension bridge opened in Colorado in 1929.
 
  
  
 
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[[File:HansenSoon.JPG|1000px|center]]<br />
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Hansen 1919 Bridge Elevation<br />
 
Hansen 1919 Bridge Elevation<br />
 
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[[File:1Hansen.jpg|1000px|center]]
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[[File:1Hansen.jpg|750px|center]]
 
Hansen suspension bridge postcard.
 
Hansen suspension bridge postcard.
  
  
[[File:3HansenPostcard.jp|1000px|center]]
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[[File:3HansenPostcard.jpg|750px|center]]
 
Hansen suspension bridge postcard.
 
Hansen suspension bridge postcard.
  
  
[[File:4HansenPostcard.jpg|1000px|center]]
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[[File:6HansenBridge.jpg|750px|center]]
Hansen suspension bridge postcard.
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Image by Eric Sakowski / HighestBridges.com
  
  
[[File:5HansenPostcard.jpg|1000px|center]]
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[[File:8HansenBridge.jpg|750px|center]]
Hansen suspension bridge postcard.
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Image by Eric Sakowski / HighestBridges.com
  
  
[[File:6HansenSusPostcard.jpg|1000px|center]]
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[[File:4HansenPostcard.jpg|750px|center]]
 
Hansen suspension bridge postcard.
 
Hansen suspension bridge postcard.
  
  
[[File:10HansenBridge.jpg|650px|center]]
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[[File:5HansenPostcard.jpg|750px|center]]
Image by Eric Sakowski / HighestBridges.com
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Hansen suspension bridge postcard.
  
  
[[File:11HansenBridge.jpg|1000px|center]]
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[[File:6HansenSusPostcard.jpg|750px|center]]
Image by Eric Sakowski / HighestBridges.com
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Hansen suspension bridge postcard.
 
 
 
 
[[File:12HansenBridge.jpg|650px|center]]
 
Image by Eric Sakowski / HighestBridges.com
 
  
  
[[File:13HansenBridge.jpg|650px|center]]
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[[File:2HansenBridge.jpg|750px|center]]
Image by Eric Sakowski / HighestBridges.com
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The 1966 replacement Hansen bridge.  You can see more images of the steel girder span under the Hansen 1966 Bridge entry.  Image by Eric Sakowski / HighestBridges.com
  
  
[[File:14HansenBridgePier.jpg|1000px|center]]
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[[File:3HansenBridge.jpg|450px|center]]
 
Image by Eric Sakowski / HighestBridges.com
 
Image by Eric Sakowski / HighestBridges.com
  
  
[[File:15HansenBridge.jpg|620px|center]]
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[[File:11HansenBridge.jpg|750px|center]]
 
Image by Eric Sakowski / HighestBridges.com
 
Image by Eric Sakowski / HighestBridges.com
  
  
[[File:16HansenBridge.jpg|1000px|center]]
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[[File:HansenAerial.jpg|520px|center]]
Image by Eric Sakowski / HighestBridges.com
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Hansen Bridge satellite image.
  
  
 
[[Category:Bridges in United States]]
 
[[Category:Bridges in United States]]
 
[[Category:Bridges in Idaho, United States]]
 
[[Category:Bridges in Idaho, United States]]

Latest revision as of 22:50, 25 January 2017

Hansen 1919 Bridge
Hansen, Idaho, United States
345 feet high / 105 meters high
608 foot span / 185 meter span
1919-1966

2HansenPostcard.jpg


The highest bridge in North America upon its completion in 1919, the Hansen suspension bridge had a main span of 608 feet (185 mtrs) and a pony truss side span of 80 feet (24 mtrs). Engineer R. M. Murray enclosed the road deck within an extremely large stiffening truss 20 feet (6 mtrs) deep. The truss was 17 feet (5 mtrs) wide between the centerline of the beams while the two main cables were 30 feet (9 mtrs) apart at the towers. To ensure the rigidity of the span, two large wind cables were located below the full length of the deck and anchored into rock on the rims of the gorge. The north tower was the tallest of the two at 117 feet (36 mtrs). Total cost: $100,000.

With a road deck width of just 14 feet (4 mtrs), the bridge had been obsolete for years and in 1966 the old suspension span was replaced by a new steel girder Hansen bridge with two concrete piers that descend all the way to the bottom of the canyon.



Hansen 1919 Bridge Elevation


1Hansen.jpg

Hansen suspension bridge postcard.


3HansenPostcard.jpg

Hansen suspension bridge postcard.


6HansenBridge.jpg

Image by Eric Sakowski / HighestBridges.com


8HansenBridge.jpg

Image by Eric Sakowski / HighestBridges.com


4HansenPostcard.jpg

Hansen suspension bridge postcard.


5HansenPostcard.jpg

Hansen suspension bridge postcard.


6HansenSusPostcard.jpg

Hansen suspension bridge postcard.


2HansenBridge.jpg

The 1966 replacement Hansen bridge. You can see more images of the steel girder span under the Hansen 1966 Bridge entry. Image by Eric Sakowski / HighestBridges.com


3HansenBridge.jpg

Image by Eric Sakowski / HighestBridges.com


11HansenBridge.jpg

Image by Eric Sakowski / HighestBridges.com


HansenAerial.jpg

Hansen Bridge satellite image.