US Bridges

SH 121 NB Off Ramp over Cottonwood Creek

Good

Collin County, Texas · 1.7 MI W of US 75 · Structure no. 180430036404442

Built
2009
16 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
455 ft
4 main spans
Daily traffic
15,937
2017 count
Owner
Toll Authority
Local Toll Authority

About this bridge

SH 121 NB Off Ramp over Cottonwood Creek is a prestressed concrete stringer/multi-beam or girder carrying SH 121 NB Off Ramp over Cottonwood Creek in Collin County, Texas. It was built in 2009, so it is 16 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 15,937 vehicles a day, roughly 7% of them trucks, projected to reach 40,210 by 2028. The structure is 455 ft (138.7 m) long and 30 ft wide.

Location

Open in Google Maps
CarriesSH 121 NB Off Ramp
CrossesCottonwood Creek
Location1.7 MI W of US 75
CountyCollin County
StateTexas
Coordinates33.14664, -96.67333
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 protection8 Very GoodNo problems noted.
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 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 typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length455 ft (138.7 m)
Longest span125 ft (38.1 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,937 (2017)
Projected traffic40,210 by 2028
Trucks7%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a toll 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 121 NB Off Ramp over Cottonwood Creek built?

It was built in 2009, making it 16 years old in 2025.

What condition is SH 121 NB Off Ramp 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 NB Off Ramp over Cottonwood Creek carry?

About 15,937 vehicles per day (2017 count), of which roughly 7% are trucks.

How long is SH 121 NB Off Ramp over Cottonwood Creek?

The structure is 455 ft (138.7 m) long with a longest span of 125 ft (38.1 m) and a deck 30 ft wide.

Who owns SH 121 NB Off Ramp over Cottonwood Creek?

It is owned by the Local Toll Authority.