4 votes

Joseph Julian Henry Memorial - Airport Highway Bridge



3 span K-4 Hybrid Camelback, 2 Warren PTC through truss spans on State Highway 75

View is from west side, looking east

Photo taken by Calvin Sneed in July 2008



Street Views 


Lost camelback through truss bridge over South Fork Holston River on State Highway 75
Sullivan County, Tennessee
Demolished, replaced by concrete tee-beam bridge
Built 1938, closed 2010, demolished 2011
- Tennessee State Highway Department
3 middle spans (K-4 Hybrid Camelback)
2 approach spans on either side (Warren PTC Riveted)
Length of largest span: 180.1 ft.
Total length: 877.0 ft.
Deck width: 23.9 ft.
Vertical clearance above deck: 15.0 ft.
Also called
Highway 75 Bridge
Approximate latitude, longitude
+36.44831, -82.44232   (decimal degrees)
36°26'54" N, 82°26'32" W   (degrees°minutes'seconds")
Approximate UTM coordinates
17/370742/4034641 (zone/easting/northing)
Quadrangle map:
Boone Dam
Inventory numbers
TN 82SR0750001 (Tennessee bridge number)
BH 32714 (Bridgehunter.com ID)
Inspection (as of 05/2009)
Deck condition rating: Satisfactory (6 out of 9)
Superstructure condition rating: Poor (4 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 31.5 (out of 100)
Average daily traffic (as of 2009)

Update Log 

  • August 26, 2010: New photos from Calvin Sneed
  • July 10, 2010: New Street View added by Calvin Sneed
  • March 25, 2010: New photos from Calvin Sneed
  • February 25, 2009: Updated by C Hanchey
  • August 3, 2008: Updated by Calvin Sneed
  • July 29, 2008: Updated by Calvin Sneed
  • July 28, 2008: Updated by Kim Harvey: added category
  • July 28, 2008: New photos from Calvin Sneed
  • July 27, 2008: Updated by Calvin Sneed
  • July 4, 2008: Updated by Calvin Sneed


  • Calvin Sneed - us43137415 [at] yahoo [dot] com
  • Kim Harvey
  • C Hanchey - cmh2315fl [at] yahoo [dot] com


Airport Highway Bridge
Posted May 18, 2010, by Calvin Sneed (us43137415 [at] yahoo [dot] com)

The Camelback spans here are also not K-Parker spans.

The state of Tennessee did not have any K-Parker spans..

Back in the 20's and 30's, the state built hybrids utilizing the K-span concept to get the span length engineers wanted, but the bridges are hybrids only, not genuine K-spans.


Airport Highway Bridge
Posted December 31, 2009, by Calvin Sneed (us43137415 [at] yahoo [dot] com)

You're correct.. they are not ponies.. my bad. T-DOT Region 1's Engineer in Charge of Bridges, says the two approach spans on either end are Through Camelback, Subdivided Warren Trusses. I sent him pictures and requested clarification.

Airport Highway Bridge
Posted January 7, 2009, by anthony dillon (spansaver [at] hotmail [dot] com)

The approach spans on this bridge are unique. They are not ponies as stated in the text, but are indeed through trusses. They have an arched top-chord, but with only 4 slopes. A Camelback has 5 and a Parker 6 or more. Not sure what you would classify these spans as.