US Bridges

S Oak DR over Flag Ditch

Fair

Brazoria County, Texas · 0.25 MI SW of SH 288 · Structure no. 120200B00540001

Built
1981
44 years old, rebuilt 1984
Condition
Fair
inspected December 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
129 ft
3 main spans
Daily traffic
2,970
2012 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

S Oak DR over Flag Ditch is a prestressed concrete box beam or girders - multiple carrying S Oak DR over Flag Ditch in Brazoria County, Texas. It was built in 1981 and reconstructed in 1984, so it is 44 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 2,970 vehicles a day, roughly 1% of them trucks, projected to reach 3,400 by 2032. The structure is 129 ft (39.3 m) long and 69 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesS Oak DR
CrossesFlag Ditch
Location0.25 MI SW of SH 288
RouteCity Street 0
CountyBrazoria County
StateTexas
Coordinates29.03308, -95.45175
Functional classUrban Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
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 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length129 ft (39.3 m)
Longest span43 ft (13.1 m)
Deck width69 ft (21 m)
Roadway width57 ft (17.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,970 (2012)
Projected traffic3,400 by 2032
Trucks1%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$19,000
NavigationNo navigation control on waterway

Frequently asked questions

When was S Oak DR over Flag Ditch built?

It was built in 1981, making it 44 years old in 2025. It was reconstructed in 1984.

What condition is S Oak DR over Flag Ditch 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 2023.

How much traffic does S Oak DR over Flag Ditch carry?

About 2,970 vehicles per day (2012 count), of which roughly 1% are trucks.

How long is S Oak DR over Flag Ditch?

The structure is 129 ft (39.3 m) long with a longest span of 43 ft (13.1 m) and a deck 69 ft wide.

Who owns S Oak DR over Flag Ditch?

It is owned by the Town or Township Highway Agency.