US Bridges

SH 121 over Trib of Cottonwood Creek

Fair

Collin County, Texas · 2.7 MI SW of US 75 · Structure no. 180430036404145

Built
2011
14 years old
Condition
Fair
inspected December 2023
Type
Culvert
Concrete
Length
34 ft
3 main spans
Daily traffic
15,759
2019 count
Owner
Toll Authority
Local Toll Authority

About this bridge

SH 121 over Trib of Cottonwood Creek is a concrete culvert carrying SH 121 over Trib of Cottonwood Creek in Collin County, Texas. It was built in 2011, so it is 14 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 15,759 vehicles a day, roughly 6% of them trucks, projected to reach 115,972 by 2038. The structure is 34 ft (10.4 m) long and 456 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSH 121
CrossesTrib of Cottonwood Creek
Location2.7 MI SW of US 75
CountyCollin County
StateTexas
Coordinates33.14179, -96.68692
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
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 geometry9: Superior to present desirable 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 typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length34 ft (10.4 m)
Longest span10 ft (3 m)
Deck width456 ft (139 m)
Roadway width255 ft (77.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,759 (2019)
Projected traffic115,972 by 2038
Trucks6%
Lanes on structure16
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a toll road
National Highway SystemYes

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 over Trib of Cottonwood Creek built?

It was built in 2011, making it 14 years old in 2025.

What condition is SH 121 over Trib of Cottonwood 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 December 2023.

How much traffic does SH 121 over Trib of Cottonwood Creek carry?

About 15,759 vehicles per day (2019 count), of which roughly 6% are trucks.

How long is SH 121 over Trib of Cottonwood Creek?

The structure is 34 ft (10.4 m) long with a longest span of 10 ft (3 m) and a deck 456 ft wide.

Who owns SH 121 over Trib of Cottonwood Creek?

It is owned by the Local Toll Authority.