US Bridges

SH99 SB / SH146 NB over Wetland

Good

Harris County, Texas · At SH 99/SH 146 Inter. · Structure no. 121020038913108

Built
1996
29 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
360 ft
3 main spans
Daily traffic
3,000
2017 count
Owner
State
State Highway Agency

About this bridge

SH99 SB / SH146 NB over Wetland is a steel continuous stringer/multi-beam or girder carrying SH99 SB / SH146 NB over Wetland in Harris County, Texas. It was built in 1996, so it is 29 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 3,000 vehicles a day, roughly 8% of them trucks, projected to reach 4,200 by 2042. The structure is 360 ft (109.7 m) long and 29 ft wide.

CarriesSH99 SB / SH146 NB
CrossesWetland
LocationAt SH 99/SH 146 Inter.
RouteState Highway 146
StateTexas
Coordinates29.7142, -94.99854
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating60 US tons
Inventory rating36 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length360 ft (109.7 m)
Longest span140 ft (42.7 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2017)
Projected traffic4,200 by 2042
Trucks8%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free 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 SH99 SB / SH146 NB over Wetland built?

It was built in 1996, making it 29 years old in 2025.

What condition is SH99 SB / SH146 NB over Wetland 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 October 2024.

How much traffic does SH99 SB / SH146 NB over Wetland carry?

About 3,000 vehicles per day (2017 count), of which roughly 8% are trucks.

How long is SH99 SB / SH146 NB over Wetland?

The structure is 360 ft (109.7 m) long with a longest span of 140 ft (42.7 m) and a deck 29 ft wide.

Who owns SH99 SB / SH146 NB over Wetland?

It is owned by the State Highway Agency.