Structure 142460001509684 · Williamson County, TX

Ih35 Nt/a @ Fm3406 over IH 35 Ml

Carries Ih35 Nt/a @ Fm3406 over IH 35 Ml, 1.4 Mi N Of US 79.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure8/9 · Very Good
Substructure8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT252 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 8/9Substructure 8/9

252 ft end to end, longest span 126 ft: about 3 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 box-beam bridge.

Built20179 years old
Length252.0 ft76.8 m
Daily traffic—reported figure implausible
Last inspectedMarch 2023every 48 months

Location

StateTexas
CountyWilliamson
Location1.4 Mi N Of US 79
CarriesIh35 Nt/a @ Fm3406
CrossesIH 35 Ml
Coordinates30.53563, -97.69215

Physical Characteristics

MaterialConcrete
DesignBox Beam - Multiple
Total Length252.0 ft (76.8 m)
Max Span126.0 ft (38.4 m)
Deck Width29.9 ft (9.1 m)
Deck Area698.9 sq m
Main Spans2
Year Built2017

Traffic

Avg Daily Traffic84,030 (2013)
That is about 84,030 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 Traffic17%
Lanes On Bridge1
Lanes Under Bridge8

Inspection & Ownership

Last InspectionMarch 2023
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number142460001509684

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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