US Bridges

SH 147 over Ayish Bayou

Fair

San Augustine County, Texas · 0.95 MI N of US 96 · Structure no. 112030039001063

Built
1975
50 years old
Condition
Fair
inspected May 2024
Type
Culvert
Concrete
Length
62 ft
5 main spans
Daily traffic
863
2020 count
Owner
State
State Highway Agency

About this bridge

SH 147 over Ayish Bayou is a concrete culvert carrying SH 147 over Ayish Bayou in San Augustine County, Texas. It was built in 1975, so it is 50 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 863 vehicles a day, roughly 9% of them trucks, projected to reach 1,208 by 2040. The structure is 62 ft (18.9 m) long and 50 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSH 147
CrossesAyish Bayou
Location0.95 MI N of US 96
RouteState Highway 147
CountySan Augustine County
StateTexas
Coordinates31.52298, -94.11869
Functional classRural Minor Arterial

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.6 US tons
Inventory rating26.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span10 ft (3 m)
Deck width50 ft (15.3 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic863 (2020)
Projected traffic1,208 by 2040
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 SH 147 over Ayish Bayou built?

It was built in 1975, making it 50 years old in 2025.

What condition is SH 147 over Ayish 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 May 2024.

How much traffic does SH 147 over Ayish Bayou carry?

About 863 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is SH 147 over Ayish Bayou?

The structure is 62 ft (18.9 m) long with a longest span of 10 ft (3 m) and a deck 50 ft wide.

Who owns SH 147 over Ayish Bayou?

It is owned by the State Highway Agency.