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Black Prince Trestle


Wooden bridge on North Side Road (North Side Rd) east of Calder
Shoshone County, Idaho
Open to traffic
Built 1912; rehabilitated 1991
Timber stringer
Length of largest span: 14.1 ft.
Total length: 141.1 ft.
Deck width: 12.5 ft.
Approximate latitude, longitude
+47.27308, -116.11057   (decimal degrees)
47°16'23" N, 116°06'38" W   (degrees°minutes'seconds")
Approximate UTM coordinates
11/567273/5235894 (zone/easting/northing)
Quadrangle map:
Marble Creek
Average daily traffic (as of 2015)
Inventory numbers
ID 30996 (Idaho bridge number)
BH 14950 (Bridgehunter.com ID)
Inspection report (as of August 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: 37.8 (out of 100)
View more at BridgeReports.com


Beam (17,120)
Built 1912 (886)
Built during 1910s (10,080)
Idaho (552)
One-lane traffic (8,009)
Open (41,210)
Owned by county (21,727)
Shoshone County, Idaho (47)
Span length under 25 feet (7,133)
Timber stringer (4,393)
Total length 125-175 feet (6,353)
Wooden deck (6,217)

Update Log 

  • March 20, 2012: Updated by Craig Philpott: corrected location



Black Prince Trestle
Posted May 21, 2009, by Gene McCluney (mccluney [at] sbcglobal [dot] net)

It has to be a vehicular/road bridge, as it has an inspection date and vehicle per-day count in the statistics. Railroad bridges are not inspected by county and state road inspectors.

Black Prince Trestle
Posted May 21, 2009, by Anonymous

Is this a train bridge that goes over the Black Prince Creek as it goes into the St.Joe river? Or is this a people and auto bridge? I am trying to find an aerial view photo of the old train bridge over the Black Prince Creek as it flows into the river. Not far from there is a very very old abandoned saw mill high up overlooking the river. Does anyone know the original name of this sawmill?