SR 18 over I 20


+32.29286, -90.26667
32°17'34" N, 90°16'00" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:SR 18 over I 20
Structure number:31000180250556B
Location:SR 18 OVER I 20
Purpose:Carries highway over highway
Route classification:Other Principal Arterial (Urban) [14]
Length of largest span:102.0 ft. [31.1 m]
Total length:337.9 ft. [103.0 m]
Roadway width between curbs:40.4 ft. [12.3 m]
Deck width edge-to-edge:44.0 ft. [13.4 m]
Vertical clearance below bridge:17.4 ft. [5.3 m]
Skew angle:10°
Owner:State Highway Agency [01]
Year built:1969
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:4
Main spans material:Concrete continuous [2]
Main spans design:Box Beam or girders - Single or Spread [06]
Deck type:Concrete Cast-in-Place [1]

Latest Available Inspection: May 2016

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:15,000 [as of 2014]
Truck traffic:3% of total traffic
Deck condition:Fair [5 out of 9]
Superstructure condition:Fair [5 out of 9]
Substructure condition:Very Good [8 out of 9]
Structural appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Deck geometry appraisal:Better than present minimum criteria [7]
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:96.9 tons [88.1 metric tons]
Inventory rating:58.4 tons [53.1 metric tons]
Sufficiency rating:77.2

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
May 201677.2FairFairFairVery Good-15000
June 201480.0FairFairFairVery Good-17500
May 201280.1FairFairFairVery Good-16000
May 201080.1FairFairFairVery Good-15500
May 200892.1FairSatisfactoryVery GoodVery Good-17500
October 200692.1FairSatisfactoryVery GoodVery Good-17500
July 200494.4GoodGoodVery GoodVery Good-13000
August 200294.3GoodGoodVery GoodVery Good-14000
August 200094.4GoodGoodVery GoodVery Good-12000
July 199894.4GoodGoodVery GoodVery Good-12000
September 199695.0GoodGoodVery GoodVery Good-12000
December 199493.0GoodGoodVery GoodVery Good-12000
February 199393.0GoodGoodVery GoodVery Good-11580
March 199193.0GoodGoodVery GoodVery Good-10720