US Bridges

SH 121 N to Dnt N over Dnt & SH 121

Good

Collin County, Texas · Dnt & SH 121 Toll RD · Structure no. 180430036404625

Built
2011
14 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
4,280 ft
6 main spans
Daily traffic
10,000
2010 count
Owner
Toll Authority
Local Toll Authority

About this bridge

SH 121 N to Dnt N over Dnt & SH 121 is a steel continuous stringer/multi-beam or girder carrying SH 121 N to Dnt 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 10,000 vehicles a day, roughly 2% of them trucks, projected to reach 13,000 by 2030. The structure is 4,280 ft (1,304.5 m) long and 28 ft wide.

Location

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CarriesSH 121 N to Dnt N
CrossesDnt & SH 121
LocationDnt & SH 121 Toll RD
CountyCollin County
StateTexas
Coordinates33.09096, -96.82354
Functional classUrban Other Principal Arterial

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 geometry3: Basically intolerable, requiring high priority of corrective action
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 spans6 (+24 approach)
Design loadHL 93
Structure length4,280 ft (1,304.5 m)
Longest span301 ft (91.7 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,000 (2010)
Projected traffic13,000 by 2030
Trucks2%
Lanes on structure1
Traffic directionOne-way traffic
CarriesFourth 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 SH 121 N to Dnt N over Dnt & SH 121 built?

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

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

About 10,000 vehicles per day (2010 count), of which roughly 2% are trucks.

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

The structure is 4,280 ft (1,304.5 m) long with a longest span of 301 ft (91.7 m) and a deck 28 ft wide.

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

It is owned by the Local Toll Authority.