US Bridges

SH 288 Sbml over Flag Lake Drainage Canal

Fair

Brazoria County, Texas · 0.55 MI S of SH 332 · Structure no. 120200011108030

Built
1942
83 years old, rebuilt 1963
Condition
Fair
inspected December 2024
Type
Slab
Concrete Continuous
Length
125 ft
3 main spans
Daily traffic
16,853
2019 count
Owner
State
State Highway Agency

About this bridge

SH 288 Sbml over Flag Lake Drainage Canal is a concrete continuous slab carrying SH 288 Sbml over Flag Lake Drainage Canal in Brazoria County, Texas. It was built in 1942 and reconstructed in 1963, so it is 83 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 16,853 vehicles a day, roughly 10% of them trucks, projected to reach 17,180 by 2033. The structure is 125 ft (38.1 m) long and 54 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSH 288 Sbml
CrossesFlag Lake Drainage Canal
Location0.55 MI S of SH 332
RouteState Highway 288
CountyBrazoria County
StateTexas
Coordinates28.99736, -95.38498
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadH 15
Structure length125 ft (38.1 m)
Longest span25 ft (7.6 m)
Deck width54 ft (16.4 m)
Roadway width52 ft (15.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,853 (2019)
Projected traffic17,180 by 2033
Trucks10%
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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$458,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 288 Sbml over Flag Lake Drainage Canal built?

It was built in 1942, making it 83 years old in 2025. It was reconstructed in 1963.

What condition is SH 288 Sbml over Flag Lake Drainage Canal 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 December 2024.

How much traffic does SH 288 Sbml over Flag Lake Drainage Canal carry?

About 16,853 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is SH 288 Sbml over Flag Lake Drainage Canal?

The structure is 125 ft (38.1 m) long with a longest span of 25 ft (7.6 m) and a deck 54 ft wide.

Who owns SH 288 Sbml over Flag Lake Drainage Canal?

It is owned by the State Highway Agency.