US Bridges

SH 121 Nbfr over East Rowlett Crk

Fair

Collin County, Texas · 4.6 MI W of US 75 · Structure no. 180430036404139

Built
2005
20 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
330 ft
3 main spans
Daily traffic
23,646
2023 count
Owner
Toll Authority
Local Toll Authority

About this bridge

SH 121 Nbfr over East Rowlett Crk is a prestressed concrete stringer/multi-beam or girder carrying SH 121 Nbfr over East Rowlett Crk 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 23,646 vehicles a day, roughly 3% of them trucks, projected to reach 39,052 by 2038. The structure is 330 ft (100.6 m) long and 51 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSH 121 Nbfr
CrossesEast Rowlett Crk
Location4.6 MI W of US 75
RouteState Highway 121
CountyCollin County
StateTexas
Coordinates33.1293, -96.71969
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
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 spans3
Design loadHS 20
Structure length330 ft (100.6 m)
Longest span110 ft (33.5 m)
Deck width51 ft (15.5 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,646 (2023)
Projected traffic39,052 by 2038
Trucks3%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$33,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 121 Nbfr over East Rowlett Crk built?

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

What condition is SH 121 Nbfr over East Rowlett Crk 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 December 2023.

How much traffic does SH 121 Nbfr over East Rowlett Crk carry?

About 23,646 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is SH 121 Nbfr over East Rowlett Crk?

The structure is 330 ft (100.6 m) long with a longest span of 110 ft (33.5 m) and a deck 51 ft wide.

Who owns SH 121 Nbfr over East Rowlett Crk?

It is owned by the Local Toll Authority.