US Bridges

Spur 547 over Ayish Bayou

Fair

San Augustine County, Texas · 0.10 MI E of SH 21 · Structure no. 112030011809044

Built
1934
91 years old, rebuilt 1960
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
147 ft
1 main span
Daily traffic
1,128
2020 count
Owner
State
State Highway Agency

About this bridge

Spur 547 over Ayish Bayou is a steel continuous stringer/multi-beam or girder carrying Spur 547 over Ayish Bayou in San Augustine County, Texas. It was built in 1934 and reconstructed in 1960, so it is 91 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 5 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 1,128 vehicles a day, roughly 14% of them trucks, projected to reach 1,579 by 2040. The structure is 147 ft (44.9 m) long and 51 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSpur 547
CrossesAyish Bayou
Location0.10 MI E of SH 21
RouteState Highway 547
CountySan Augustine County
StateTexas
Coordinates31.53128, -94.11606
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry8: Equal to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39 US tons
Inventory rating23 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadUnknown
Structure length147 ft (44.9 m)
Longest span71 ft (21.6 m)
Deck width51 ft (15.6 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,128 (2020)
Projected traffic1,579 by 2040
Trucks14%
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 Spur 547 over Ayish Bayou built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1960.

What condition is Spur 547 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 Spur 547 over Ayish Bayou carry?

About 1,128 vehicles per day (2020 count), of which roughly 14% are trucks.

How long is Spur 547 over Ayish Bayou?

The structure is 147 ft (44.9 m) long with a longest span of 71 ft (21.6 m) and a deck 51 ft wide.

Who owns Spur 547 over Ayish Bayou?

It is owned by the State Highway Agency.