Rating:
1 vote

Blanchard Bridge

Photos 

Blanchard, North Dakota

Flickr user Andrew Filer

License: Creative Commons Attribution-Share-Alike (CC BY-SA)

View this photo on Flickr

BH Photo #314823

Map 

Description 

According to its nomination, it is significant "for its association with attempts by North Dakota counties to expand and improve transportation networks prior to 1926 by construction of through truss bridges, relatively costly structures. Through truss bridges with documented construction dates and builders, such as this one, best illustrate this important trend in North Dakota bridge construction."

- Wikipedia

Design details of the bridge's substructure and superstructure are outlined below:

Substructure: abutments of steel tubular piers with wood plank backwalls and wing walls

Superstructure: upperchords: two channel sections with continuous cover plate along the upper flanges and batten plates along the lower flanges

lowerchords: paired punched eyebars

verticals; two channel sections with lacing bars along both sets of flanges

diagonals: paired punched eyebars

bracing (portal): paired angle sections (bridge plate above portal)

top lateral strut: two pairs of angle sections with lacing bars in between

laterals (bottom): round rods

moveable end: rollers

floor system: wood stringers, resting on I-beam floor beams, connected to the superstructure with U-bolts

decking: a single layer of wood

railing: lattice

steelmaker's marks: Cambria Steel Co., Johnstown, Pa.

- NRHP Nomination Form

Facts 

Overview
Pratt through truss bridge on old alignment of 5th Street over Elm River
Location
Traill County, North Dakota
Status
Removed but not replaced; Lally columns remain
History
Built 1900; Removed 2007
Builders
- Cambria Steel Co. of Johnstown, Pennsylvania (steel manufacturer)
- Dibley & Robinson of Fargo, North Dakota (builder)
Design
Pin-connected Pratt through truss
Approximate latitude, longitude
+47.33973, -97.21682   (decimal degrees)
47°20'23" N, 97°13'01" W   (degrees°minutes'seconds")
Approximate UTM coordinates
14/634703/5244459 (zone/easting/northing)
Quadrangle map:
Blanchard
Inventory number
BH 65767 (Bridgehunter.com ID)

Update Log 

  • January 29, 2015: Added by Dave King

Sources 

  • nps.gov - NRHP Nomination Form
  • Dave King - DKinghawkfan [at] hotmail [dot] com