Rating:
2 votes

Keystone Interchange Bridge

Pennington County, South Dakota
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Photos 

Photo taken by David Reynolds in June 2007

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Map 

Street Views 

View Uglybridges.com report

Facts 

Overview
Wooden arch bridge on US 16A
Location
Pennington County, South Dakota
Status
Open to traffic
History
Built 1968
Design
Wooden open-spandrel arch
Dimensions
Length of largest span: 154.9 ft.
Total length: 290.0 ft.
Deck width: 25.9 ft.
Approximate latitude, longitude
+43.92500, -103.44278   (decimal degrees)
43°55'30" N, 103°26'34" W   (degrees°minutes'seconds")
Approximate UTM coordinates
13/625006/4864721 (zone/easting/northing)
USGS topographic map
Mount Rushmore
Inventory numbers
SD 52-308-412 (South Dakota structure number)
BH 32303 (Bridgehunter.com ID)
Inspection (as of 05/2010)
Deck condition rating: Satisfactory (6 out of 9)
Superstructure condition rating: Good (7 out of 9)
Substructure condition rating: Good (7 out of 9)
Appraisal: Functionally obsolete
Sufficiency rating: 94.0 (out of 100)
Average daily traffic (as of 2011)
1,739

Categories 

Arch (9,440)
Built 1968 (88)
Built during 1960s (1,230)
Deck arch (8,724)
Functionally obsolete (7,054)
Have street view (10,036)
Open (28,454)
 Owned by state (9,854)
Pennington County, South Dakota (19)
South Dakota (425)
Span length 125-175 feet (2,966)
Timber arch (17)
Total length 250-500 feet (3,382)
US 16 (9)

Update Log 

  • October 13, 2010: New Street View added by Craig Philpott
  • September 30, 2009: New photos from David Backlin
  • March 4, 2008: New photos from Ruth Reynolds

Sources 

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Comments 

Keystone Interchange Bridge
Posted October 14, 2010, by Anthony Dillon (spansaver [at] hotmail [dot] com)

Very unique indeed! Beats the heck out of a slab!!

Keystone Interchange Bridge
Posted October 13, 2010, by Craig Philpott (cphilpott [at] puc [dot] edu)

This wooden interchange from 1968 is so exceptional and I wonder if there are any other such wooden structures.