US Bridges

SH 347 NB over Main a Canal

Fair

Jefferson County, Texas · 0.4 MI NW of Spur 136 · Structure no. 201240066701005

Built
1963
62 years old
Condition
Fair
inspected July 2024
Type
Slab
Concrete Continuous
Length
80 ft
3 main spans
Daily traffic
8,457
2020 count
Owner
State
State Highway Agency

About this bridge

SH 347 NB over Main a Canal is a concrete continuous slab carrying SH 347 NB over Main a Canal in Jefferson County, Texas. It was built in 1963, so it is 62 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 8,457 vehicles a day, roughly 9% of them trucks, projected to reach 11,310 by 2033. The structure is 80 ft (24.4 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSH 347 NB
CrossesMain a Canal
Location0.4 MI NW of Spur 136
RouteState Highway 347
CountyJefferson County
StateTexas
Coordinates29.95168, -93.95552
Functional classUrban Other Principal 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43 US tons
Inventory rating26 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadOther
Structure length80 ft (24.4 m)
Longest span30 ft (9.1 m)
Deck width40 ft (12.2 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,457 (2020)
Projected traffic11,310 by 2033
Trucks9%
Lanes on structure2
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 347 NB over Main a Canal built?

It was built in 1963, making it 62 years old in 2025.

What condition is SH 347 NB over Main a 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 July 2024.

How much traffic does SH 347 NB over Main a Canal carry?

About 8,457 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is SH 347 NB over Main a Canal?

The structure is 80 ft (24.4 m) long with a longest span of 30 ft (9.1 m) and a deck 40 ft wide.

Who owns SH 347 NB over Main a Canal?

It is owned by the State Highway Agency.