Structure 180570009214220 · Dallas County, TX

IH 45 SB Off Ramp over Trinity River Branch

Carries IH 45 SB Off Ramp over Trinity River Branch, 1.0 Mi N Of Illinois St..

Overall conditionFair

Set by its lowest-rated component: Substructure at 6 of 9.

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT699 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

699 ft end to end, longest span 78 ft: about 1.9 football fields. 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.

Built197254 years old
Length699.1 ft213.1 m
Daily traffic—reported figure implausible
Last inspectedMarch 2024every 24 months

Location

StateTexas
CountyDallas
Location1.0 Mi N Of Illinois St.
CarriesIH 45 SB Off Ramp
CrossesTrinity River Branch
Coordinates32.72665, -96.76323

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length699.1 ft (213.1 m)
Max Span78.1 ft (23.8 m)
Deck Width27.2 ft (8.3 m)
Deck Area1768.7 sq m
Main Spans9
Year Built1972

Traffic

Avg Daily Traffic86,329 (2023)
That is about 86,329 vehicles per lane per day — beyond what any U.S. road carries (the busiest freeways run about 25,000–30,000). It is almost certainly a data-entry error in the National Bridge Inventory, so we leave this bridge out of traffic rankings.
Truck Traffic3%
Lanes On Bridge1

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical8 — Stable, low risk
Structure Number180570009214220

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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