US Bridges

SH 288 Nbml over Flag Lake Drainage Canal

Fair

Brazoria County, Texas · 0.55 MI S of SH 332 · Structure no. 120200011108043

Built
1957
68 years old, rebuilt 1970
Condition
Fair
inspected December 2024
Type
Slab
Concrete
Length
126 ft
5 main spans
Daily traffic
14,998
2019 count
Owner
State
State Highway Agency

About this bridge

SH 288 Nbml over Flag Lake Drainage Canal is a concrete slab carrying SH 288 Nbml over Flag Lake Drainage Canal in Brazoria County, Texas. It was built in 1957 and reconstructed in 1970, so it is 68 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 14,998 vehicles a day, roughly 10% of them trucks, projected to reach 17,180 by 2033. The structure is 126 ft (38.4 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSH 288 Nbml
CrossesFlag Lake Drainage Canal
Location0.55 MI S of SH 332
RouteState Highway 288
CountyBrazoria County
StateTexas
Coordinates28.99745, -95.38477
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 protection6 SatisfactoryStructural elements show some minor deterioration.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.9 US tons
Inventory rating38 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadOther
Structure length126 ft (38.4 m)
Longest span25 ft (7.6 m)
Deck width50 ft (15.1 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,998 (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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$151,000
NavigationNo navigation control on waterway

Frequently asked questions

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

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1970.

What condition is SH 288 Nbml 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 Nbml over Flag Lake Drainage Canal carry?

About 14,998 vehicles per day (2019 count), of which roughly 10% are trucks.

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

The structure is 126 ft (38.4 m) long with a longest span of 25 ft (7.6 m) and a deck 50 ft wide.

Who owns SH 288 Nbml over Flag Lake Drainage Canal?

It is owned by the State Highway Agency.