+38.58832, -90.21449
38°35'18" N, 90°12'52" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:IS 55 N over CST POTOMAC ST
Structure number:881
Location:S 34 T 45 N R 7 E
Purpose:Carries highway over highway
Route classification:Principal Arterial - Interstate (Urban) [11]
Length of largest span:65.3 ft. [19.9 m]
Total length:176.8 ft. [53.9 m]
Roadway width between curbs:54.1 ft. [16.5 m]
Deck width edge-to-edge:56.8 ft. [17.3 m]
Vertical clearance below bridge:19.7 ft. [6.0 m]
Skew angle:30°
Owner:State Highway Agency [01]
Year built:1965
Year reconstructed:1985
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18+Mod / HS 20+Mod [6]
Number of main spans:3
Main spans material:Concrete continuous [2]
Main spans design:Slab [01]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Bituminous [6]

Latest Available Inspection: August 2015

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:51,162 [as of 2015]
Truck traffic:12% of total traffic
Deck condition:Satisfactory [6 out of 9]
Superstructure condition:Satisfactory [6 out of 9]
Substructure condition:Satisfactory [6 out of 9]
Structural appraisal:Equal to present minimum criteria [6]
Deck geometry appraisal:Basically intolerable requiring high priority of replacement [2]
Underclearances appraisal:Meets minimum tolerable limits to be left in place as is [4]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Scour condition:Bridge not over waterway. [N]
Operating rating:72.3 tons [65.7 metric tons]
Inventory rating:43.6 tons [39.6 metric tons]
Sufficiency rating:73.8
Recommended work:Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Estimated cost of work:$1,246,000

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
August 201573.8FairSatisfactorySatisfactorySatisfactoryFO51162
August 201373.5FairSatisfactorySatisfactorySatisfactoryFO55873
August 201174.5FairSatisfactorySatisfactorySatisfactoryFO40393
September 200974.4FairSatisfactorySatisfactorySatisfactoryFO41213
August 200773.5FairSatisfactorySatisfactorySatisfactoryFO55636
August 200574.0FairSatisfactorySatisfactorySatisfactoryFO47517
July 200374.1FairSatisfactorySatisfactorySatisfactoryFO47093
June 200175.2FairSatisfactorySatisfactorySatisfactoryFO46216

Element Data

Source: National Bridge Elements dataset, 2016 edition. This feature is experimental.
ElementUnitsQuantity1. Good2. Fair3. Poor4. Serious
Reinforced Concrete Columneach80800
Reinforced Concrete Abutmentlinear ft.16510719390
Concrete Protective Coatingsq. ft.2002000
Bridge Rail
Reinforced Concrete Bridge Raillinear ft.3840368160
Concrete Protective Coatingsq. ft.2402400
Reinforced Concrete Slabsq. ft.10,02605,6644,3620
Wearing Surfacessq. ft.9,5729,572000
Concrete Protective Coatingsq. ft.280028000