+38.74176, -106.08289
38°44'30" N, 106°04'58" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:US 285 SR over CHALK CREEK SR
Structure number:J-12-H
Location:at NATHROP
Purpose:Carries highway over waterway
Route classification:Principal Arterial - Other (Rural) [02]
Length of largest span:59.1 ft. [18.0 m]
Total length:62.0 ft. [18.9 m]
Roadway width between curbs:24.9 ft. [7.6 m]
Deck width edge-to-edge:28.5 ft. [8.7 m]
Owner:State Highway Agency [01]
Year built:1932
Historic significance:Bridge is possibly eligible for the National Register of Historic Places [3]
Design load:M 13.5 / H 15 [2]
Main span material:Steel [3]
Main span design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Bituminous [6]

Latest Available Inspection: November 2015

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:101 [as of 2010]
Truck traffic:2% of total traffic
Deck condition:Satisfactory [6 out of 9]
Superstructure condition:Good [7 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Equal to present minimum criteria [6]
Deck geometry appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Water adequacy appraisal:Equal to present desirable criteria [8]
Roadway alignment appraisal:Equal to present desirable criteria [8]
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]
Pier/abutment protection:Navigation protection not required [1]
Scour condition:Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Operating rating:40.9 tons [37.2 metric tons]
Inventory rating:25.0 tons [22.7 metric tons]
Sufficiency rating:83.2

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
November 201583.2FairSatisfactoryGoodGood-101
November 201383.2FairSatisfactoryGoodGood-101
December 201183.2FairSatisfactoryGoodGood-101
November 200966.7FairSatisfactoryGoodGoodFO6900
October 200766.7FairSatisfactoryGoodGoodFO6900
November 200566.7FairSatisfactoryGoodGoodFO6957
November 200387.2FairSatisfactoryGoodGood-84
October 200186.9GoodGoodGoodGood-84
November 199986.9GoodGoodGoodGood-52
October 199767.2GoodGoodGoodGoodFO4950
November 199567.3GoodGoodGoodGoodFO4950
October 199364.0GoodGoodGoodGoodFO2350
October 199264.0GoodGoodGoodGoodFO2350
November 199064.1GoodGoodVery GoodGoodFO2100

Element Data

Source: National Bridge Elements dataset, 2016 edition. This feature is experimental.
ElementUnitsQuantity1. Good2. Fair3. Poor4. Serious
Steel Girder/Beamlinear ft.3102605000
Steel Protective Coatingsq. ft.3102600050
Reinforced Concrete Decksq. ft.1,7611,36140000
Wearing Surfacessq. ft.1,5501,550000
Reinforced Concrete Abutmentlinear ft.57352020
Movable Bearingeach50500
Steel Protective Coatingsq. ft.50005
Fixed Bearingeach55000
Steel Protective Coatingsq. ft.55000
Bridge Rail
Reinforced Concrete Bridge Raillinear ft.124124000