I 20 over US 78 (AL-4)


+33.53098, -86.71156
33°31'52" N, 86°42'42" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:I 20 over US 78 (AL-4)
Structure number:011071
Old structure number:00000I20370024B (from 1992 edition)
Location:I 20 * US 78
Purpose:Carries highway over highway
Route classification:Principal Arterial - Interstate (Urban) [11]
Length of largest span:133.9 ft. [40.8 m]
Total length:1028.9 ft. [313.6 m]
Roadway width between curbs:65.0 ft. [19.8 m]
Deck width edge-to-edge:67.6 ft. [20.6 m]
Vertical clearance below bridge:17.7 ft. [5.4 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:11
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:Superior to present desirable criteria [9]
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:82.3 tons [74.8 metric tons]
Inventory rating:49.3 tons [44.8 metric tons]
Sufficiency rating:94.4
Recommended work:Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Estimated cost of work:$15,849,000

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
October 201694.4FairSatisfactorySatisfactoryGood-27875
November 201494.4FairSatisfactorySatisfactoryGood-27875
November 201283.4FairSatisfactoryFairGood-24165
October 201083.4FairSatisfactoryFairGood-23415
October 200883.4FairGoodFairGood-23805
October 200683.5FairGoodFairGood-23155
October 200482.5FairGoodFairGood-22830
October 200282.5FairGoodFairGood-22885
October 200082.5FairGoodFairGood-22430
November 199881.5FairGoodFairGood-31265
August 199681.6FairGoodFairGood-30560
August 199482.6FairGoodFairGood-27540
September 199294.4GoodGoodGoodGood-20700
October 199092.6GoodGoodGoodGood-21810

Element Data

Source: National Bridge Elements dataset, 2016 edition. This feature is experimental.
ElementUnitsQuantity1. Good2. Fair3. Poor4. Serious
Steel Girder/Beamlinear ft.7,2427,04220000
Steel Protective Coatingsq. ft.7,2420007,242
Reinforced Concrete Decksq. ft.57,568057,56800
Wearing Surfacessq. ft.57,568057,56800
Reinforced Concrete Columneach5205200
Reinforced Concrete Abutmentlinear ft.132132000
Reinforced Concrete Pier Caplinear ft.51021030000
Open Jointlinear ft.672006720
Movable Bearingeach7800780
Fixed Bearingeach7907900
Bridge Rail
Reinforced Concrete Bridge Raillinear ft.2,0562,056000