Rating:
2 votes

Little Oak Creek Bridge

Photos 

Photo taken by Nick Schmiedeler in February 2018

Enlarge

BH Photo #418291

Map 

Facts 

Overview
Bedstead pony truss bridge over Little Oak Creek, 2.7 mi. west and 3.0 mi. north of Cawker City
Location
Mitchell County, Kansas
Status
Open to traffic
History
Built ca. 1910
Design
Bedstead Pratt pony truss
Dimensions
Length of largest span: 40.0 ft.
Total length: 42.0 ft.
Deck width: 15.7 ft.
Approximate latitude, longitude
+39.55298, -98.48297   (decimal degrees)
39°33'11" N, 98°28'59" W   (degrees°minutes'seconds")
Approximate UTM coordinates
14/544420/4378272 (zone/easting/northing)
Quadrangle map:
Cawker City
Land survey
T. 6 S., R. 10 W., Sec. 6
Average daily traffic (as of 2002)
20
Inventory numbers
KS 000620697303620 (Kansas local bridge number on the National Bridge Inventory)
BH 18162 (Bridgehunter.com ID)
Inspection report (as of April 2017)
Overall condition: Fair
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Deck condition rating: Satisfactory (6 out of 9)
Sufficiency rating: 31.2 (out of 100)
View more at BridgeReports.com

Update Log 

  • February 17, 2018: New photos from Nick Schmiedeler
  • October 3, 2015: Updated by David Backlin: Added Road Name

Sources 

Comments 

Little Oak Creek Bridge
Posted February 19, 2018, by Gil Graham, P.E. (ggraham [at] baileybridge [dot] com)

Interesting situation. It appears the abutments must be leaning in causing the bottom chord to go into compression. On a two panel bridge like this, a truss analysis would show that the bottom chords carry zero load anyway. All of the "tension" load is carried by the truss end diagonals. You can also see the counter diagonal rod sagging from compression like the bottom chord.

Little Oak Creek Bridge
Posted February 18, 2018, by Nick Schmiedeler (nick [at] nickschmiedeler [dot] com)

yes, bottom chord not only not under tension, but drooping pretty drastically on both sides, the drive over to do a U-turn and drive back over again were a bit of a life-gamble....not sure how many more drive-overs this thing has left in it

Little Oak Creek Bridge
Posted February 18, 2018, by Clark Vance (cvance [at] dogmail [dot] com)

The lower chord seems not to be under tension. I wonder how much everything shifts when under load.

Little Oak Creek Bridge
Posted February 18, 2018, by Robert Elder (robertelder1 [at] gmail [dot] com)

Nick:

Those bizarre features you have discovered are known as laced top chords and laced bottom chords. These are extremely rare features today.

Some bridges have laced endposts as well. This bridge has laced endposts a lace top cord and a laced bottom cord. As far as lacing is concerned it hits the trifecta. That makes this bridge very unusual.

Little Oak Creek Bridge
Posted February 17, 2018, by Nick Schmiedeler (nick [at] nickschmiedeler [dot] com)

also, not sure I've seen that laced "running board" and top horizontal before....this one seems unique

Little Oak Creek Bridge
Posted February 17, 2018, by Nick Schmiedeler (nick [at] nickschmiedeler [dot] com)

this is one wanky, dilapidated old beat-up bedstead-type, basically at the end of a dead-end road before it turns to private property, I imagine it is rarely used at all anymore, I took a short video clip jumping up and down on the deck and gently pushing on the iron, I had to stop it was shaking so badly - would have to say on the new scale, this one would definitely qualify with a "poor" rating