US Bridges

SH 99 over Drainage Ditch

Good

Montgomery County, Texas · 3.3 MI NE of Hrdy Toll RD · Structure no. 121700351007243

Built
2016
9 years old
Condition
Good
inspected November 2024
Type
Culvert
Concrete
Length
47 ft
4 main spans
Daily traffic
6,000
2016 count
Owner
State
State Highway Agency

About this bridge

SH 99 over Drainage Ditch is a concrete culvert carrying SH 99 over Drainage Ditch in Montgomery County, Texas. It was built in 2016, so it is 9 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 6,000 vehicles a day, roughly 10% of them trucks, projected to reach 150,000 by 2036. The structure is 47 ft (14.3 m) long and 294 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSH 99
CrossesDrainage Ditch
Location3.3 MI NE of Hrdy Toll RD
StateTexas
Coordinates30.12253, -95.37204
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 inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable 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 spans4
Design loadHL 93
Structure length47 ft (14.3 m)
Longest span10 ft (3 m)
Deck width294 ft (89.5 m)
Roadway width128 ft (39 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,000 (2016)
Projected traffic150,000 by 2036
Trucks10%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a toll road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
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 99 over Drainage Ditch built?

It was built in 2016, making it 9 years old in 2025.

What condition is SH 99 over Drainage Ditch 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 2024.

How much traffic does SH 99 over Drainage Ditch carry?

About 6,000 vehicles per day (2016 count), of which roughly 10% are trucks.

How long is SH 99 over Drainage Ditch?

The structure is 47 ft (14.3 m) long with a longest span of 10 ft (3 m) and a deck 294 ft wide.

Who owns SH 99 over Drainage Ditch?

It is owned by the State Highway Agency.