US Bridges

SH 121 NB FR over Drain

Good

Denton County, Texas · 2.75 MI NE of IH 35E · Structure no. 180610354701008

Built
1999
26 years old
Condition
Good
inspected April 2023
Type
Culvert
Concrete
Length
24 ft
3 main spans
Daily traffic
15,000
2014 count
Owner
Toll Authority
Local Toll Authority

About this bridge

SH 121 NB FR over Drain is a concrete culvert carrying SH 121 NB FR over Drain in Denton County, Texas. It was built in 1999, so it is 26 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 15,000 vehicles a day, projected to reach 18,000 by 2034. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSH 121 NB FR
CrossesDrain
Location2.75 MI NE of IH 35E
RouteState Highway 121
StateTexas
Coordinates33.03008, -96.92941
Functional classUrban Other Principal Arterial

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 protection8 Very GoodNo problems noted.
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 length24 ft (7.3 m)
Longest span5 ft (1.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,000 (2014)
Projected traffic18,000 by 2034
Trucks0%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
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 NB FR over Drain built?

It was built in 1999, making it 26 years old in 2025.

What condition is SH 121 NB FR 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 NB FR over Drain carry?

About 15,000 vehicles per day (2014 count).

How long is SH 121 NB FR over Drain?

The structure is 24 ft (7.3 m) long with a longest span of 5 ft (1.5 m).

Who owns SH 121 NB FR over Drain?

It is owned by the Local Toll Authority.