US Bridges

SH 121 over Sloan Creek

Good

Collin County, Texas · 0.4 MI W of US 75 · Structure no. 180430036404163

Built
2005
20 years old, rebuilt 2009
Condition
Good
inspected November 2023
Type
Culvert
Concrete
Length
38 ft
3 main spans
Daily traffic
22,000
2010 count
Owner
Toll Authority
Local Toll Authority

About this bridge

SH 121 over Sloan Creek is a concrete culvert carrying SH 121 over Sloan Creek in Collin County, Texas. It was built in 2005 and reconstructed in 2009, so it is 20 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 22,000 vehicles a day, roughly 8% of them trucks, projected to reach 37,360 by 2027. The structure is 38 ft (11.6 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSH 121
CrossesSloan Creek
Location0.4 MI W of US 75
CountyCollin County
StateTexas
Coordinates33.15522, -96.65216
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,000 (2010)
Projected traffic37,360 by 2027
Trucks8%
Lanes on structure15
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 SH 121 over Sloan Creek built?

It was built in 2005, making it 20 years old in 2025. It was reconstructed in 2009.

What condition is SH 121 over Sloan Creek 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 over Sloan Creek carry?

About 22,000 vehicles per day (2010 count), of which roughly 8% are trucks.

How long is SH 121 over Sloan Creek?

The structure is 38 ft (11.6 m) long with a longest span of 10 ft (3 m).

Who owns SH 121 over Sloan Creek?

It is owned by the Local Toll Authority.