Structure 142460032004077 · Williamson County, TX

US 79 NB over Bu 79

Carries US 79 NB over Bu 79, 3.45 Mi E Of FM 973.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT286 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 7/9

286 ft end to end, longest span 88 ft: about 4 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.

Built197254 years old
Length286.1 ft87.2 m
Daily traffic3,375counted 2019
Last inspectedMarch 2023every 48 months

Location

StateTexas
CountyWilliamson
Location3.45 Mi E Of FM 973
CarriesUS 79 NB
CrossesBu 79
Coordinates30.57402, -97.38209

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length286.1 ft (87.2 m)
Max Span87.9 ft (26.8 m)
Deck Width44.3 ft (13.5 m)
Deck Area1177.2 sq m
Main Spans2
Year Built1972

Traffic

Avg Daily Traffic3,375 (2019)
Truck Traffic31%
Lanes On Bridge1
Lanes Under Bridge4

Inspection & Ownership

Last InspectionMarch 2023
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour CriticalNot applicable
Structure Number142460032004077

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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