Structure 180570009513390 · Dallas County, TX

IH 20 WB over IH 635 Conn C

Carries IH 20 WB over IH 635 Conn C, 0.7 Mi N Of US 175.

Overall conditionFair

Set by its lowest-rated component: Deck and Superstructure at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT408 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 7/9

408 ft end to end, longest span 67 ft: about 6 semi-trucks nose to tail. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.

Built198739 years old
Length408.1 ft124.4 m
Daily traffic607counted 2014
Last inspectedAugust 2023every 48 months

Location

StateTexas
CountyDallas
Location0.7 Mi N Of US 175
CarriesIH 20 WB
CrossesIH 635 Conn C
Coordinates32.69993, -96.62699

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length408.1 ft (124.4 m)
Max Span66.9 ft (20.4 m)
Deck Width45.9 ft (14 m)
Deck Area1741.6 sq m
Main Spans7
Year Built1987

Traffic

Avg Daily Traffic607 (2014)
Truck Traffic21%
Lanes On Bridge2
Lanes Under Bridge3

Inspection & Ownership

Last InspectionAugust 2023
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number180570009513390

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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