US Bridges

S Post Oak RD NB over Willow Waterhole Bayou

Fair

Harris County, Texas · 0.90 MI N of US 90A · Structure no. 121020B52313003

Built
1989
36 years old
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
120 ft
1 main span
Daily traffic
7,870
2013 count
Owner
City
City or Municipal Highway Agency

About this bridge

S Post Oak RD NB over Willow Waterhole Bayou is a prestressed concrete box beam or girders - multiple carrying S Post Oak RD NB over Willow Waterhole Bayou in Harris County, Texas. It was built in 1989, so it is 36 years old, younger than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 7,870 vehicles a day, projected to reach 40,000 by 2033. The structure is 120 ft (36.6 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesS Post Oak RD NB
CrossesWillow Waterhole Bayou
Location0.90 MI N of US 90A
RouteCity Street 0
CountyHarris County
StateTexas
Coordinates29.6603, -95.46402
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length120 ft (36.6 m)
Longest span50 ft (15.2 m)
Deck width43 ft (13.2 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,870 (2013)
Projected traffic40,000 by 2033
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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$10,000
NavigationNo navigation control on waterway

Frequently asked questions

When was S Post Oak RD NB over Willow Waterhole Bayou built?

It was built in 1989, making it 36 years old in 2025.

What condition is S Post Oak RD NB over Willow Waterhole Bayou in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2023.

How much traffic does S Post Oak RD NB over Willow Waterhole Bayou carry?

About 7,870 vehicles per day (2013 count).

How long is S Post Oak RD NB over Willow Waterhole Bayou?

The structure is 120 ft (36.6 m) long with a longest span of 50 ft (15.2 m) and a deck 43 ft wide.

Who owns S Post Oak RD NB over Willow Waterhole Bayou?

It is owned by the City or Municipal Highway Agency.