5 votes

Big Island Bridge


View Looking Northwest Toward South Web

Photo taken by Historic American Engineering Record

View photos at Library of Congress

BH Photo #160506


Pratt through truss bridge over Green River on CR 4 (Big Island Road)
Sweetwater County, Wyoming
Built 1909-10
- Charles G. Sheely of Denver, Colorado
Two-span, pin-connected Pratt through truss
Length of largest span: 155.0 ft.
Total length: 310.0 ft.
Deck width: 12.5 ft.
Also called
ETR Green River Bridge
Approximate latitude, longitude
+41.76432, -109.73527   (decimal degrees)
41°45'52" N, 109°44'07" W   (degrees°minutes'seconds")
Approximate UTM coordinates
12/605128/4624382 (zone/easting/northing)
Quadrangle map:
Big Island Bridge
Inventory number
BH 44719 (Bridgehunter.com ID)

Update Log 

  • March 26, 2019: New photos from John Bernhisel
  • February 18, 2015: Updated by Tony Dillon: status update
  • January 21, 2015: Updated by Luke: Still extant
  • April 3, 2010: Added by James Baughn


  • HAER WY-79 - Big Island Bridge, Spanning Green River on County Road No. 4, Green River vicinity, Sweetwater County, WY
  • Luke
  • Tony Dillon - spansaver [at] hotmail [dot] com
  • John Bernhisel - Johnmbernhisel [at] gmail [dot] com


Big Island Bridge
Posted March 26, 2019, by John Bernhisel (Johnmbernhisel [at] gmail [dot] com)

I went and saw this bridge in March 2019. The road off the highway was pretty muddy so I parked my car and walked the 1.5 miles to the bridge. It was well worth it. Beautiful setting. Unfortunately there is a huge power line just north that made it hard to take pictures. Deck is bad, I walked across but wouldn’t recommend it. The Green River was shallow here, maybe 2 feet deep, but I’m sure it floods way out in this spot.

Big Island Bridge
Posted February 18, 2015, by Robert Edsall (carto [dot] robedsall [at] gmail [dot] com)

we visited this bridge last summer. it is closed to traffic. we walked out onto the deck and found huge holes across the span... I saw no sign of rehabilitation or construction. It's a beautiful spot, with lots of birds - a nice oasis in an otherwise sparse area.

Big Island Bridge
Posted March 12, 2011, by J.P.

I believe this bridge still exists via google earth