US Bridges

SH 121 Nbml over Denton Creek

Fair

Dallas County, Texas · 0.3 MI SW of Denton C/L · Structure no. 180570036402083

Built
1991
34 years old, rebuilt 2016
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
675 ft
9 main spans
Daily traffic
84,287
2023 count
Owner
State
State Highway Agency

About this bridge

SH 121 Nbml over Denton Creek is a prestressed concrete stringer/multi-beam or girder carrying SH 121 Nbml over Denton Creek in Dallas County, Texas. It was built in 1991 and reconstructed in 2016, so it is 34 years old, younger 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 84,287 vehicles a day, roughly 6% of them trucks, projected to reach 58,180 by 2031. The structure is 675 ft (205.7 m) long and 82 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSH 121 Nbml
CrossesDenton Creek
Location0.3 MI SW of Denton C/L
RouteState Highway 121
CountyDallas County
StateTexas
Coordinates32.98699, -97.01311
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to 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

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20
Structure length675 ft (205.7 m)
Longest span75 ft (22.9 m)
Deck width82 ft (25 m)
Roadway width79 ft (24 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic84,287 (2023)
Projected traffic58,180 by 2031
Trucks6%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$64,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 121 Nbml over Denton Creek built?

It was built in 1991, making it 34 years old in 2025. It was reconstructed in 2016.

What condition is SH 121 Nbml over Denton Creek 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 February 2024.

How much traffic does SH 121 Nbml over Denton Creek carry?

About 84,287 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is SH 121 Nbml over Denton Creek?

The structure is 675 ft (205.7 m) long with a longest span of 75 ft (22.9 m) and a deck 82 ft wide.

Who owns SH 121 Nbml over Denton Creek?

It is owned by the State Highway Agency.