Structure 210310003908388 · Cameron County, TX

US 77 SB over SH 100

Carries US 77 SB over SH 100, 2.70 Mi SE Of FM 732.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT258 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

258 ft end to end: 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.

Built200620 years old
Length257.9 ft78.6 m
Daily traffic30,029counted 2023
Last inspectedMarch 2023every 48 months

Location

StateTexas
CountyCameron
Location2.70 Mi SE Of FM 732
CarriesUS 77 SB
CrossesSH 100
Coordinates26.08093, -97.57984

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length257.9 ft (78.6 m)
Max Span124.0 ft (37.8 m)
Deck Width59.1 ft (18 m)
Deck Area1414.8 sq m
Main Spans1
Year Built2006

Traffic

Avg Daily Traffic30,029 (2023)
Truck Traffic8%
Lanes On Bridge3
Lanes Under Bridge7

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 Number210310003908388

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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