US Bridges

SH 121 Sbfr over East Rowlett CR

Fair

Collin County, Texas · 4.6 MI W of US 75 · Structure no. 180430036404138

Built
2005
20 years old, rebuilt 2009
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
330 ft
3 main spans
Daily traffic
15,312
2020 count
Owner
Toll Authority
Local Toll Authority

About this bridge

SH 121 Sbfr over East Rowlett CR is a prestressed concrete stringer/multi-beam or girder carrying SH 121 Sbfr over East Rowlett CR in Collin County, Texas. It was built in 2005 and reconstructed in 2009, 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 15,312 vehicles a day, roughly 3% of them trucks, projected to reach 29,320 by 2038. The structure is 330 ft (100.6 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSH 121 Sbfr
CrossesEast Rowlett CR
Location4.6 MI W of US 75
RouteState Highway 121
CountyCollin County
StateTexas
Coordinates33.13, -96.72021
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
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 width63 ft (19.1 m)
Roadway width52 ft (15.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,312 (2020)
Projected traffic29,320 by 2038
Trucks3%
Lanes on structure4
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 Sbfr over East Rowlett CR built?

It was built in 2005, making it 20 years old in 2025. It was reconstructed in 2009.

What condition is SH 121 Sbfr over East Rowlett CR 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 Sbfr over East Rowlett CR carry?

About 15,312 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is SH 121 Sbfr over East Rowlett CR?

The structure is 330 ft (100.6 m) long with a longest span of 110 ft (33.5 m) and a deck 63 ft wide.

Who owns SH 121 Sbfr over East Rowlett CR?

It is owned by the Local Toll Authority.