US Bridges

SH121 to US75 Conn over SH 121 & US 75

Good

Collin County, Texas · At Int US 75 & SH 121 · Structure no. 180430036404456

Built
2011
14 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
4,807 ft
38 main spans
Daily traffic
12,410
2020 count
Owner
Toll Authority
Local Toll Authority

About this bridge

SH121 to US75 Conn over SH 121 & US 75 is a prestressed concrete stringer/multi-beam or girder carrying SH121 to US75 Conn over SH 121 & US 75 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 12,410 vehicles a day, roughly 3% of them trucks, projected to reach 17,370 by 2040. The structure is 4,807 ft (1,465.2 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSH121 to US75 Conn
CrossesSH 121 & US 75
LocationAt Int US 75 & SH 121
RouteState Highway 0
CountyCollin County
StateTexas
Coordinates33.16121, -96.63934
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 inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal 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 spans38 (+3 approach)
Design loadHL 93
Structure length4,807 ft (1,465.2 m)
Longest span132 ft (40.2 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck18 ft (5.4 m)

Traffic and service

Average daily traffic12,410 (2020)
Projected traffic17,370 by 2040
Trucks3%
Lanes on structure1
Traffic directionOne-way traffic
CarriesFourth level (interchange)
CrossesHighway
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 SH121 to US75 Conn over SH 121 & US 75 built?

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

What condition is SH121 to US75 Conn over SH 121 & US 75 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 December 2023.

How much traffic does SH121 to US75 Conn over SH 121 & US 75 carry?

About 12,410 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is SH121 to US75 Conn over SH 121 & US 75?

The structure is 4,807 ft (1,465.2 m) long with a longest span of 132 ft (40.2 m) and a deck 28 ft wide.

Who owns SH121 to US75 Conn over SH 121 & US 75?

It is owned by the Local Toll Authority.