SR 18 over I-75


+33.02808, -83.90998
33°01'41" N, 83°54'36" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:SR 18 over I-75
Structure number:000000020700690
Location:.5 MI E OF FORSYTH
Purpose:Carries highway over highway
Route classification:Major Collector (Rural) [07]
Length of largest span:147.0 ft. [44.8 m]
Total length:410.1 ft. [125.0 m]
Roadway width between curbs:56.1 ft. [17.1 m]
Deck width edge-to-edge:59.7 ft. [18.2 m]
Vertical clearance below bridge:16.4 ft. [5.0 m]
Skew angle:48°
Owner:State Highway Agency [01]
Year built:1989
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: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:Good
Status:Open, no restriction [A]
Average daily traffic:4,140 [as of 2011]
Truck traffic:1% of total traffic
Deck condition:Good [7 out of 9]
Superstructure condition:Good [7 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Better than present minimum criteria [7]
Deck geometry appraisal:Superior to present desirable criteria [9]
Underclearances appraisal:Equal to present minimum criteria [6]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Scour condition:Bridge not over waterway. [N]
Sufficiency rating:98.0
Estimated cost of work:$3,058,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
October 2016GoodGoodGoodGood414098.0
October 2014GoodGoodGoodGood414098.0
October 2012GoodGoodGoodGood4140100.0
October 2010GoodGoodGoodGood2540100.0
November 2008GoodGoodGoodGood2540100.0
October 2006GoodGoodGoodGood2400100.0
October 2004GoodGoodGoodGood2390100.0
November 2002GoodGoodVery GoodGood2200100.0
December 2000GoodGoodVery GoodGood4400100.0
December 1998GoodVery GoodVery GoodGood4400100.0
August 1996GoodVery GoodVery GoodGood4400100.0
October 1994GoodVery GoodVery GoodGood4400100.0
February 1993GoodVery GoodVery GoodGood1730100.0
March 1991GoodVery GoodVery GoodVery Good1730100.0

Element Data

Source: National Bridge Elements dataset, 2018 edition. This feature is experimental.
Steel Girder/Beamlinear ft.3,2803,280000
Steel Protective Coatingsq. ft.46,2424,86127,60013,7810
Reinforced Concrete Decksq. ft.24,43624,4063000
Reinforced Concrete Columneach1212000
Reinforced Concrete Abutmentlinear ft.2382280100
Reinforced Concrete Pier Caplinear ft.243235800
Strip Seal Jointlinear ft.1661550101
Pourable Jointlinear ft.166001660
Movable Bearingeach3232000
Steel Protective Coatingsq. ft.6464000
Fixed Bearingeach3231100
Steel Protective Coatingsq. ft.6464000
Bridge Rail
Reinforced Concrete Bridge Raillinear ft.740740000