US Bridges

SH 121 NB on Ramp over Timber Creek

Fair

Denton County, Texas · 0.10 MI E of IH 35E · Structure no. 180610354701004

Built
1999
26 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,163 ft
10 main spans
Daily traffic
15,000
2014 count
Owner
Toll Authority
Local Toll Authority

About this bridge

SH 121 NB on Ramp over Timber Creek is a prestressed concrete stringer/multi-beam or girder carrying SH 121 NB on Ramp over Timber Creek in Denton County, Texas. It was built in 1999, so it is 26 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 15,000 vehicles a day, projected to reach 18,000 by 2034. The structure is 1,163 ft (354.5 m) long and 38 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSH 121 NB on Ramp
CrossesTimber Creek
Location0.10 MI E of IH 35E
RouteState Highway 121
CountyDenton County
StateTexas
Coordinates33.00103, -96.9567
Functional classUrban Local

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans10 (+2 approach)
Design loadHS 20
Structure length1,163 ft (354.5 m)
Longest span110 ft (33.5 m)
Deck width38 ft (11.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,000 (2014)
Projected traffic18,000 by 2034
Trucks0%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerLocal Toll Authority
Maintained byLocal Toll Authority
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 121 NB on Ramp over Timber Creek built?

It was built in 1999, making it 26 years old in 2025.

What condition is SH 121 NB on Ramp over Timber 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 November 2023.

How much traffic does SH 121 NB on Ramp over Timber Creek carry?

About 15,000 vehicles per day (2014 count).

How long is SH 121 NB on Ramp over Timber Creek?

The structure is 1,163 ft (354.5 m) long with a longest span of 110 ft (33.5 m) and a deck 38 ft wide.

Who owns SH 121 NB on Ramp over Timber Creek?

It is owned by the Local Toll Authority.