Rating:
1 vote

Choccolocco Creek Bridge

Map 

Facts 

Overview
Pratt through truss bridge over Choccolocco Creek on Brown Bridge Road
Location
Calhoun County, Alabama
Status
Open to traffic
History
Built 1947
Design
Pratt through truss
Dimensions
Span length: 78.1 ft.
Total length: 78.1 ft.
Deck width: 12.5 ft.
Approximate latitude, longitude
+33.80250, -85.64694   (decimal degrees)
33°48'09" N, 85°38'49" W   (degrees°minutes'seconds")
Approximate UTM coordinates
16/625244/3741080 (zone/easting/northing)
Quadrangle map:
Jacksonville East
Average daily traffic (as of 1994)
185
Inventory numbers
AL 3135 (Alabama bridge number)
BH 52732 (Bridgehunter.com ID)
Inspection report (as of November 2017)
Overall condition: Poor
Superstructure condition rating: Serious (3 out of 9)
Substructure condition rating: Fair (5 out of 9)
Deck condition rating: Serious (3 out of 9)
Sufficiency rating: 14.8 (out of 100)
View more at BridgeReports.com

Update Log 

  • June 25, 2012: Photo imported by James McCray
  • June 24, 2012: Added by James McCray

Sources 

  • James McCray - jamesinslocomb [at] yahoo [dot] com
  • Brown Bridge Road - Pic of Bridge

Comments 

Choccolocco Creek Bridge
Posted April 17, 2014, by Zachary S

A bridge on this road, presumably this one, is scheduled for replacement as per the ATRIP project list.

Choccolocco Creek Bridge
Posted June 25, 2012, by Fmiser (fmiser [at] gmail [dot] com)

Hmmm. I'm speculating here...

But my guess is the upper truss is a height addition to the lower Pratt truss. There is a joint in the end post where the middle chord (???) is. This would make the lower truss a stand-alone truss - but likely with only about 10 ft clearance.

So was the upper truss put there to add height to overhead clearance? Or was it put there to add strength to the primary truss?

My vote is height. Why? While the vertical members line up, the diagonals do not. And the diagonals don't pass the full height. If the goal was to add span length or weight capacity, not having diagonals from the top to the bottom is a weakness.

The clearance is posted as 13 ft 5 in but nearly every bridge has a bit more clearance than posted. Standard height for a full height truck is 13 ft 6 in. Thus a truck will try to find another route - or procede with great caution. Most likely it will fit - but a prudent driver would proceed very carefully. Rough calculations suggest the clearance _without_ the upper truss would be about 10 ft. It's clear a bridge with 13.5 ft clearance would be more useful than a bridge with 10 ft clearance.

Just a reminder, I don't _know_ why there is a double-stack truss - but I can twist some logic to support these possible explanations.

Choccolocco Creek Bridge
Posted June 25, 2012, by Tony Dillon (spansaver [at] hotmail [dot] com)

very strange indeed. I would like to see a side view before confirming this as a Pratt. Could be some type of offset Lattice as well.

Choccolocco Creek Bridge
Posted June 25, 2012, by Robert Elder (robertelder1 [at] gmail [dot] com)

Very interesting bridge. Perhaps a Pratt through truss that has had its height increased? It looks like a Pratt on top of another Pratt.

Choccolocco Creek Bridge
Posted June 25, 2012, by James McCray (jamesinslocomb [at] yahoo [dot] com)

What kind of truss is this????!!? I'm starting to get a little freaked out. I just discovered this bridge last night and I imagine this is some kind or variation of a Pratt Truss or just a Pratt on meth or something. I need help here since I have never seen a truss configuration of this kind.