US Bridges

SH 121 Nbfr over W Rowlett Creek

Fair

Collin County, Texas · 0.1 MI W of FM 2478 · Structure no. 180430036404133

Built
2005
20 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
220 ft
2 main spans
Daily traffic
19,488
2020 count
Owner
Toll Authority
Local Toll Authority

About this bridge

SH 121 Nbfr over W Rowlett Creek is a prestressed concrete stringer/multi-beam or girder carrying SH 121 Nbfr over W Rowlett Creek in Collin County, Texas. It was built in 2005, so it is 20 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 19,488 vehicles a day, roughly 5% of them trucks, projected to reach 27,283 by 2040. The structure is 220 ft (67.1 m) long and 51 ft wide.

Location

Open in Google Maps
CarriesSH 121 Nbfr
CrossesW Rowlett Creek
Location0.1 MI W of FM 2478
RouteState Highway 121
CountyCollin County
StateTexas
Coordinates33.12379, -96.73525
Functional classUrban Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
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 spans2
Design loadHS 20
Structure length220 ft (67.1 m)
Longest span110 ft (33.5 m)
Deck width51 ft (15.5 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,488 (2020)
Projected traffic27,283 by 2040
Trucks5%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
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 Nbfr over W Rowlett Creek built?

It was built in 2005, making it 20 years old in 2025.

What condition is SH 121 Nbfr over W Rowlett 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 October 2023.

How much traffic does SH 121 Nbfr over W Rowlett Creek carry?

About 19,488 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is SH 121 Nbfr over W Rowlett Creek?

The structure is 220 ft (67.1 m) long with a longest span of 110 ft (33.5 m) and a deck 51 ft wide.

Who owns SH 121 Nbfr over W Rowlett Creek?

It is owned by the Local Toll Authority.