US Bridges

SH 121 over Drain

Good

Denton County, Texas · 1.20 MI NE of FM 423 · Structure no. 180610036403175

Built
2007
18 years old, rebuilt 2015
Condition
Good
inspected April 2023
Type
Culvert
Concrete
Length
34 ft
3 main spans
Daily traffic
76,750
2011 count
Owner
Toll Authority
Local Toll Authority

About this bridge

SH 121 over Drain is a concrete culvert carrying SH 121 over Drain in Denton County, Texas. It was built in 2007 and reconstructed in 2015, so it is 18 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 76,750 vehicles a day, roughly 6% of them trucks, projected to reach 145,830 by 2031. The structure is 34 ft (10.4 m) long.

CarriesSH 121
CrossesDrain
Location1.20 MI NE of FM 423
RouteState Highway 121
StateTexas
Coordinates33.07374, -96.8718
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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length34 ft (10.4 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 traffic76,750 (2011)
Projected traffic145,830 by 2031
Trucks6%
Lanes on structure14
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free 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 Drain built?

It was built in 2007, making it 18 years old in 2025. It was reconstructed in 2015.

What condition is SH 121 over Drain 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 April 2023.

How much traffic does SH 121 over Drain carry?

About 76,750 vehicles per day (2011 count), of which roughly 6% are trucks.

How long is SH 121 over Drain?

The structure is 34 ft (10.4 m) long with a longest span of 10 ft (3 m).

Who owns SH 121 over Drain?

It is owned by the Local Toll Authority.