US Bridges

SH 121 NB FR over NW Trib of Youngs Br Crk

Fair

Collin County, Texas · 0.15 MI SW of Ind Parkway · Structure no. 180430036404183

Built
2008
17 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
300 ft
2 main spans
Daily traffic
22,081
2020 count
Owner
Toll Authority
Local Toll Authority

About this bridge

SH 121 NB FR over NW Trib of Youngs Br Crk is a prestressed concrete stringer/multi-beam or girder carrying SH 121 NB FR over NW 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 22,081 vehicles a day, roughly 3% of them trucks, projected to reach 39,052 by 2040. The structure is 300 ft (91.4 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
CrossesNW Trib of Youngs Br Crk
Location0.15 MI SW of Ind Parkway
RouteState Highway 121
CountyCollin County
StateTexas
Coordinates33.118, -96.75245
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
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 (+1 approach)
Design loadHS 20
Structure length300 ft (91.4 m)
Longest span120 ft (36.6 m)
Deck width51 ft (15.5 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,081 (2020)
Projected traffic39,052 by 2040
Trucks3%
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$29,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 121 NB FR over NW 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 NW Trib of Youngs Br Crk in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in December 2023.

How much traffic does SH 121 NB FR over NW Trib of Youngs Br Crk carry?

About 22,081 vehicles per day (2020 count), of which roughly 3% are trucks.

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

The structure is 300 ft (91.4 m) long with a longest span of 120 ft (36.6 m) and a deck 51 ft wide.

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

It is owned by the Local Toll Authority.