+38.58818, -90.21433
38°35'17" N, 90°12'52" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:IS 55 S over CST POTOMAC ST
Structure number:880
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:61.4 ft. [18.7 m]
Total length:157.2 ft. [47.9 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:19.4 ft. [5.9 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:51,114 [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:63.4 tons [57.6 metric tons]
Inventory rating:38.6 tons [35.1 metric tons]
Sufficiency rating:73.8
Recommended work:Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Estimated cost of work:$1,127,000

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
August 201573.8FairSatisfactorySatisfactorySatisfactoryFO51114
August 201373.5FairSatisfactorySatisfactorySatisfactoryFO56480
August 201173.9FairSatisfactorySatisfactorySatisfactoryFO50354
September 200973.8FairSatisfactorySatisfactorySatisfactoryFO51377
August 200773.6FairSatisfactorySatisfactorySatisfactoryFO55369
August 200573.9FairSatisfactorySatisfactorySatisfactoryFO49763
July 200373.9FairSatisfactorySatisfactorySatisfactoryFO49319
June 200176.1FairSatisfactorySatisfactorySatisfactoryFO48402

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.1668639410
Concrete Protective Coatingsq. ft.4904900
Bridge Rail
Reinforced Concrete Bridge Raillinear ft.3450324210
Reinforced Concrete Slabsq. ft.8,89805,0273,8710
Wearing Surfacessq. ft.8,4918,491000
Concrete Protective Coatingsq. ft.160016000