US Bridges

SH 121 NB FR over NE Trib of Youngs Br Crk

Good

Collin County, Texas · 0.2 MI NE of Ind Parkway · Structure no. 180430036404185

Built
2008
17 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
200 ft
2 main spans
Daily traffic
65,518
2020 count
Owner
Toll Authority
Local Toll Authority

About this bridge

SH 121 NB FR over NE Trib of Youngs Br Crk is a prestressed concrete stringer/multi-beam or girder carrying SH 121 NB FR over NE Trib of Youngs Br Crk in Collin County, Texas. It was built in 2008, so it is 17 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 65,518 vehicles a day, roughly 7% of them trucks, projected to reach 91,725 by 2040. The structure is 200 ft (61 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 NB FR
CrossesNE Trib of Youngs Br Crk
Location0.2 MI NE of Ind Parkway
RouteState Highway 121
CountyCollin County
StateTexas
Coordinates33.11992, -96.74711
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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
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 spans2
Design loadHS 20
Structure length200 ft (61 m)
Longest span100 ft (30.5 m)
Deck width51 ft (15.5 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65,518 (2020)
Projected traffic91,725 by 2040
Trucks7%
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$20,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 121 NB FR over NE Trib of Youngs Br Crk built?

It was built in 2008, making it 17 years old in 2025.

What condition is SH 121 NB FR over NE Trib of Youngs Br Crk 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 SH 121 NB FR over NE Trib of Youngs Br Crk carry?

About 65,518 vehicles per day (2020 count), of which roughly 7% are trucks.

How long is SH 121 NB FR over NE Trib of Youngs Br Crk?

The structure is 200 ft (61 m) long with a longest span of 100 ft (30.5 m) and a deck 51 ft wide.

Who owns SH 121 NB FR over NE Trib of Youngs Br Crk?

It is owned by the Local Toll Authority.