US Bridges

Lp 521 over Post Oak Branch

Fair

Jackson County, Texas · 0.70 MI NE of SH 111 · Structure no. 131210008911012

Built
1929
96 years old, rebuilt 1956
Condition
Fair
inspected April 2023
Type
Culvert
Concrete
Length
23 ft
4 main spans
Daily traffic
1,580
2020 count
Owner
State
State Highway Agency

About this bridge

Lp 521 over Post Oak Branch is a concrete culvert carrying Lp 521 over Post Oak Branch in Jackson County, Texas. It was built in 1929 and reconstructed in 1956, so it is 96 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 1,580 vehicles a day, roughly 11% of them trucks, projected to reach 2,120 by 2038. The structure is 23 ft (7 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesLp 521
CrossesPost Oak Branch
Location0.70 MI NE of SH 111
RouteState Highway 521
CountyJackson County
StateTexas
Coordinates28.9828, -96.6363
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating26 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length23 ft (7 m)
Longest span5 ft (1.5 m)
Deck width49 ft (15 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,580 (2020)
Projected traffic2,120 by 2038
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 Lp 521 over Post Oak Branch built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1956.

What condition is Lp 521 over Post Oak Branch 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 April 2023.

How much traffic does Lp 521 over Post Oak Branch carry?

About 1,580 vehicles per day (2020 count), of which roughly 11% are trucks.

How long is Lp 521 over Post Oak Branch?

The structure is 23 ft (7 m) long with a longest span of 5 ft (1.5 m) and a deck 49 ft wide.

Who owns Lp 521 over Post Oak Branch?

It is owned by the State Highway Agency.