US Bridges

SH 121 Sbfr over Cottonwood Creek

Good

Collin County, Texas · 1.7 MI W of US 75 · Structure no. 180430036404140

Built
2005
20 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
440 ft
4 main spans
Daily traffic
9,351
2018 count
Owner
Toll Authority
Local Toll Authority

About this bridge

SH 121 Sbfr over Cottonwood Creek is a prestressed concrete stringer/multi-beam or girder carrying SH 121 Sbfr over Cottonwood 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 9,351 vehicles a day, roughly 5% of them trucks, projected to reach 13,091 by 2038. The structure is 440 ft (134.1 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 Sbfr
CrossesCottonwood Creek
Location1.7 MI W of US 75
RouteState Highway 121
CountyCollin County
StateTexas
Coordinates33.14723, -96.67382
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 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 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 spans4
Design loadHS 20
Structure length440 ft (134.1 m)
Longest span110 ft (33.5 m)
Deck width51 ft (15.5 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,351 (2018)
Projected traffic13,091 by 2038
Trucks5%
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$44,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 121 Sbfr over Cottonwood Creek built?

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

What condition is SH 121 Sbfr over Cottonwood Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does SH 121 Sbfr over Cottonwood Creek carry?

About 9,351 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is SH 121 Sbfr over Cottonwood Creek?

The structure is 440 ft (134.1 m) long with a longest span of 110 ft (33.5 m) and a deck 51 ft wide.

Who owns SH 121 Sbfr over Cottonwood Creek?

It is owned by the Local Toll Authority.