US Bridges

SH 121 SB over Clemons Creek

Fair

Collin County, Texas · 0.90 Mi. NE of FM 545 · Structure no. 180430054903224

Built
2017
8 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
250 ft
3 main spans
Daily traffic
6,814
2018 count
Owner
State
State Highway Agency

About this bridge

SH 121 SB over Clemons Creek is a prestressed concrete stringer/multi-beam or girder carrying SH 121 SB over Clemons Creek in Collin County, Texas. It was built in 2017, so it is 8 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 6,814 vehicles a day, roughly 11% of them trucks, projected to reach 9,540 by 2038. The structure is 250 ft (76.2 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSH 121 SB
CrossesClemons Creek
Location0.90 Mi. NE of FM 545
RouteState Highway 121
CountyCollin County
StateTexas
Coordinates33.29038, -96.54987
Functional classRural Principal Arterial - Other

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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal 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 loadHL 93
Structure length250 ft (76.2 m)
Longest span90 ft (27.4 m)
Deck width40 ft (12.2 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,814 (2018)
Projected traffic9,540 by 2038
Trucks11%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SH 121 SB over Clemons Creek built?

It was built in 2017, making it 8 years old in 2025.

What condition is SH 121 SB over Clemons 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 September 2023.

How much traffic does SH 121 SB over Clemons Creek carry?

About 6,814 vehicles per day (2018 count), of which roughly 11% are trucks.

How long is SH 121 SB over Clemons Creek?

The structure is 250 ft (76.2 m) long with a longest span of 90 ft (27.4 m) and a deck 40 ft wide.

Who owns SH 121 SB over Clemons Creek?

It is owned by the State Highway Agency.