US Bridges

SH121 Nbl over Carson ST Lit Fossil Ck

Fair

Tarrant County, Texas · SH 121 over Carson ST · Structure no. 022200036303044

Built
1970
55 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
343 ft
2 main spans
Daily traffic
43,592
2022 count
Owner
State
State Highway Agency

About this bridge

SH121 Nbl over Carson ST Lit Fossil Ck is a prestressed concrete stringer/multi-beam or girder carrying SH121 Nbl over Carson ST Lit Fossil Ck in Tarrant County, Texas. It was built in 1970, so it is 55 years old, older than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 43,592 vehicles a day, roughly 7% of them trucks, projected to reach 61,029 by 2042. The structure is 343 ft (104.5 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSH121 Nbl
CrossesCarson ST Lit Fossil Ck
LocationSH 121 over Carson ST
RouteState Highway 121
StateTexas
Coordinates32.78896, -97.25622
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2 (+4 approach)
Design loadHS 20
Structure length343 ft (104.5 m)
Longest span88 ft (26.8 m)
Deck width60 ft (18.2 m)
Roadway width57 ft (17.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic43,592 (2022)
Projected traffic61,029 by 2042
Trucks7%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH121 Nbl over Carson ST Lit Fossil Ck built?

It was built in 1970, making it 55 years old in 2025.

What condition is SH121 Nbl over Carson ST Lit Fossil Ck in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2024.

How much traffic does SH121 Nbl over Carson ST Lit Fossil Ck carry?

About 43,592 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is SH121 Nbl over Carson ST Lit Fossil Ck?

The structure is 343 ft (104.5 m) long with a longest span of 88 ft (26.8 m) and a deck 60 ft wide.

Who owns SH121 Nbl over Carson ST Lit Fossil Ck?

It is owned by the State Highway Agency.