Structure 22200036303044 · Tarrant County, TX

Sh121 Nbl over Carson ST Lit Fossil Ck

Carries Sh121 Nbl over Carson ST Lit Fossil Ck, SH 121 Over Carson ST.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
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 FT343 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 6/9 · sets the rating

343 ft end to end, longest span 88 ft: about 5 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.

Built197056 years old
Length342.8 ft104.5 m
Daily traffic43,592counted 2022
Last inspectedMay 2024every 24 months

Location

StateTexas
CountyTarrant
LocationSH 121 Over Carson ST
CarriesSh121 Nbl
CrossesCarson ST Lit Fossil Ck
Coordinates32.78896, -97.25622

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length342.8 ft (104.5 m)
Max Span87.9 ft (26.8 m)
Deck Width59.7 ft (18.2 m)
Deck Area1901.9 sq m
Main Spans2
Year Built1970

Traffic

Avg Daily Traffic43,592 (2022)
Truck Traffic7%
Lanes On Bridge3
Lanes Under Bridge4

Inspection & Ownership

Last InspectionMay 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical7 — Countermeasures installed
Structure Number022200036303044

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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