US Bridges

IH 69 / US 59 Sbml over Keegans Bayou

Fair

Harris County, Texas · 0.5 MI SW of Beltway 8 · Structure no. 121020002713130

Built
1969
56 years old, rebuilt 1988
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
260 ft
4 main spans
Daily traffic
89,868
2022 count
Owner
State
State Highway Agency

About this bridge

IH 69 / US 59 Sbml over Keegans Bayou is a prestressed concrete stringer/multi-beam or girder carrying IH 69 / US 59 Sbml over Keegans Bayou in Harris County, Texas. It was built in 1969 and reconstructed in 1988, so it is 56 years old, older 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 89,868 vehicles a day, roughly 8% of them trucks, projected to reach 131,790 by 2031. The structure is 260 ft (79.2 m) long and 102 ft wide.

CarriesIH 69 / US 59 Sbml
CrossesKeegans Bayou
Location0.5 MI SW of Beltway 8
RouteInterstate 69
StateTexas
Coordinates29.65572, -95.56383
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to 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 rating75 US tons
Inventory rating45 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length260 ft (79.2 m)
Longest span65 ft (19.8 m)
Deck width102 ft (31.1 m)
Roadway width90 ft (27.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic89,868 (2022)
Projected traffic131,790 by 2031
Trucks8%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was IH 69 / US 59 Sbml over Keegans Bayou built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 1988.

What condition is IH 69 / US 59 Sbml over Keegans 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 2024.

How much traffic does IH 69 / US 59 Sbml over Keegans Bayou carry?

About 89,868 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is IH 69 / US 59 Sbml over Keegans Bayou?

The structure is 260 ft (79.2 m) long with a longest span of 65 ft (19.8 m) and a deck 102 ft wide.

Who owns IH 69 / US 59 Sbml over Keegans Bayou?

It is owned by the State Highway Agency.