I 20 WB over US 78 (AL-4)


+33.53113, -86.71143
33°31'52" N, 86°42'41" W
Source: National Bridge Inventory
Information not verified. Use at your own risk.


Name:I 20 WB over US 78 (AL-4)
Structure number:011070
Location:I 20 * US 78
Purpose:Carries highway over highway
Route classification:Principal Arterial - Interstate (Urban) [11]
Length of largest span:105.0 ft. [32.0 m]
Total length:1009.9 ft. [307.8 m]
Roadway width between curbs:52.8 ft. [16.1 m]
Deck width edge-to-edge:55.4 ft. [16.9 m]
Vertical clearance below bridge:17.4 ft. [5.3 m]
Skew angle:99°
Owner:State Highway Agency [01]
Year built:1974
Year reconstructed:1989
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18 / HS 20 [5]
Number of main spans:10
Main spans material:Steel [3]
Main spans design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Monolithic Concrete (concurrently placed with structural deck) [1]

Latest Available Inspection: October 2016 

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:27,875 [as of 2016]
Truck traffic:16% of total traffic
Deck condition:Satisfactory [6 out of 9]
Superstructure condition:Satisfactory [6 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Equal to present minimum criteria [6]
Deck geometry appraisal:Equal to present minimum criteria [6]
Underclearances appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Roadway alignment appraisal:Better than present minimum criteria [7]
Scour condition:Bridge not over waterway. [N]
Operating rating:84.6 tons [76.9 metric tons]
Inventory rating:50.7 tons [46.1 metric tons]
Sufficiency rating:94.4
Recommended work:Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Estimated cost of work:$12,770,000

Previous Inspections 

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
October 201694.4FairSatisfactorySatisfactoryGood-27875
November 201494.4FairSatisfactorySatisfactoryGood-27875
November 201283.4FairSatisfactoryFairSatisfactory-24165
October 201083.4FairSatisfactoryFairSatisfactory-23415
October 200883.4FairGoodFairGood-23805
October 200683.5FairGoodFairGood-23155
October 200483.5FairGoodFairGood-22830
October 200283.5FairGoodFairGood-22885
October 200083.6FairGoodFairGood-22430
November 199882.6FairGoodFairGood-31265
August 199682.7FairGoodFairGood-30560
August 199483.6FairGoodFairGood-27540
September 199295.3GoodGoodGoodGood-22115