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Maiden Rock Rd. over Big Hole River

Map

Coordinates:
+45.71569, -112.75619
45°42'56" N, 112°45'22" W

Facts

Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:Maiden Rock Rd. over Big Hole River
Structure number:000000000L59197
Location:24 mi SW of Butte, MT
Purpose:Carries highway over waterway
Route classification:Local (Rural) [09]
Length of largest span:198.2 ft. [60.4 m]
Total length:202.1 ft. [61.6 m]
Roadway width between curbs:15.7 ft. [4.8 m]
Deck width edge-to-edge:21.3 ft. [6.5 m]
Vertical clearance above deck:15.1 ft. [4.6 m]
Owner:Bureau of Land Management [68]
Year built:1951
Year reconstructed:1993
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18 / HS 20 [5]
Main span material:Steel [3]
Main span design:Truss - Thru [10]
Deck type:Corrugated Steel [6]
Wearing surface:Bituminous [6]

Latest Available Inspection: August 2018

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:25 [as of 2018]
Deck condition:Satisfactory [6 out of 9]
Superstructure condition:Fair [5 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Deck geometry appraisal:Equal to present minimum criteria [6]
Water adequacy appraisal:Equal to present desirable criteria [8]
Roadway alignment appraisal:Equal to present minimum criteria [6]
Channel protection:Bank protection is in need of minor repairs. River control devices and embankment protection have a little minor damage. Banks and/or channel have minor amounts of drift. [7]
Scour condition:Bridge foundations determined to be stable for assessed or calculated scour condition. [5]
Sufficiency rating:63.4
Recommended work:Other structural work, including hydraulic replacements. [38]
Estimated cost of work:$40,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
August 2018FairSatisfactoryFairGood2563.4
August 2016FairSatisfactoryFairSatisfactory2563.4
August 2014FairSatisfactoryFairSatisfactory2563.4
September 2012FairSatisfactoryFairSatisfactory2561.4