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


BH Photo #118561



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
Average daily traffic (as of 2015)
Inventory numbers
TN 82SR0750001 (Tennessee bridge number)
BH 32714 (Bridgehunter.com ID)
Inspection report (as of March 2017)
Overall condition: Good
Superstructure condition rating: Good (7 out of 9)
Substructure condition rating: Good (7 out of 9)
Deck condition rating: Very Good (8 out of 9)
Sufficiency rating: 79.8 (out of 100)
View more at BridgeReports.com

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


Joseph Julian Henry Memorial - Airport Highway Bridge
Posted July 28, 2018, by Timothy and Joann Phillips (northforkcomputer [at] gmail [dot] com)

The good news is: Calvin Sneed did an excellent job documenting this noteworthy bridge. It's always a shame when such a treasure is demolished, but I'm thankful that Calvin took such great pictures.

The bad news is: I didn't discover Bridge Hunting until July of 2018 and missed seeing this bridge in real life.

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.