US Bridges

Dnt S to SH 121 N over Dnt & SH 121

Good

Collin County, Texas · Dnt & SH 121 Toll RD · Structure no. 180430036404629

Built
2011
14 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
924 ft
2 main spans
Daily traffic
20,206
2018 count
Owner
Toll Authority
Local Toll Authority

About this bridge

Dnt S to SH 121 N over Dnt & SH 121 is a steel continuous stringer/multi-beam or girder carrying Dnt S to SH 121 N over Dnt & SH 121 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 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 20,206 vehicles a day, projected to reach 28,288 by 2038. The structure is 924 ft (281.6 m) long and 31 ft wide.

Location

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CarriesDnt S to SH 121 N
CrossesDnt & SH 121
LocationDnt & SH 121 Toll RD
CountyCollin County
StateTexas
Coordinates33.09275, -96.82327
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+3 approach)
Design loadHL 93
Structure length924 ft (281.6 m)
Longest span221 ft (67.4 m)
Deck width31 ft (9.4 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic20,206 (2018)
Projected traffic28,288 by 2038
Trucks0%
Lanes on structure1
Traffic directionOne-way traffic
CarriesThird level (interchange)
CrossesHighway
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Dnt S to SH 121 N over Dnt & SH 121 built?

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

What condition is Dnt S to SH 121 N over Dnt & SH 121 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 Dnt S to SH 121 N over Dnt & SH 121 carry?

About 20,206 vehicles per day (2018 count).

How long is Dnt S to SH 121 N over Dnt & SH 121?

The structure is 924 ft (281.6 m) long with a longest span of 221 ft (67.4 m) and a deck 31 ft wide.

Who owns Dnt S to SH 121 N over Dnt & SH 121?

It is owned by the Local Toll Authority.