US Bridges

SH 99 NB over Ditch K150

Good

Harris County, Texas · 2.82 MI S of US 290 · Structure no. 121020351005096

Built
2013
12 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
66 ft
1 main span
Daily traffic
19,100
2010 count
Owner
State
State Highway Agency

About this bridge

SH 99 NB over Ditch K150 is a prestressed concrete stringer/multi-beam or girder carrying SH 99 NB over Ditch K150 in Harris County, Texas. It was built in 2013, so it is 12 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 19,100 vehicles a day, roughly 5% of them trucks, projected to reach 32,400 by 2030. The structure is 66 ft (20.1 m) long and 66 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSH 99 NB
CrossesDitch K150
Location2.82 MI S of US 290
CountyHarris County
StateTexas
Coordinates29.94426, -95.76836
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable 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 typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length66 ft (20.1 m)
Longest span66 ft (20.1 m)
Deck width66 ft (20.2 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,100 (2010)
Projected traffic32,400 by 2030
Trucks5%
Lanes on structure3
Traffic directionOne-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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SH 99 NB over Ditch K150 built?

It was built in 2013, making it 12 years old in 2025.

What condition is SH 99 NB over Ditch K150 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 August 2024.

How much traffic does SH 99 NB over Ditch K150 carry?

About 19,100 vehicles per day (2010 count), of which roughly 5% are trucks.

How long is SH 99 NB over Ditch K150?

The structure is 66 ft (20.1 m) long with a longest span of 66 ft (20.1 m) and a deck 66 ft wide.

Who owns SH 99 NB over Ditch K150?

It is owned by the State Highway Agency.