US Bridges

SH 43 over Blackwell Lake Slough

Good

Harrison County, Texas · 3.9 MI S of FM 2625 · Structure no. 191030020705023

Built
1996
29 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
160 ft
2 main spans
Daily traffic
3,390
2020 count
Owner
State
State Highway Agency

About this bridge

SH 43 over Blackwell Lake Slough is a prestressed concrete stringer/multi-beam or girder carrying SH 43 over Blackwell Lake Slough in Harrison County, Texas. It was built in 1996, so it is 29 years old, younger than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,390 vehicles a day, roughly 24% of them trucks, projected to reach 5,410 by 2031. The structure is 160 ft (48.8 m) long and 46 ft wide. If it were closed, the detour would be 18 mi (29 km).

CarriesSH 43
CrossesBlackwell Lake Slough
Location3.9 MI S of FM 2625
RouteState Highway 43
StateTexas
Coordinates32.3764, -94.45374
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length160 ft (48.8 m)
Longest span80 ft (24.4 m)
Deck width46 ft (14 m)
Roadway width44 ft (13.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,390 (2020)
Projected traffic5,410 by 2031
Trucks24%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 km)
TollOn a free road
National Highway SystemNo
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 43 over Blackwell Lake Slough built?

It was built in 1996, making it 29 years old in 2025.

What condition is SH 43 over Blackwell Lake Slough in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does SH 43 over Blackwell Lake Slough carry?

About 3,390 vehicles per day (2020 count), of which roughly 24% are trucks.

How long is SH 43 over Blackwell Lake Slough?

The structure is 160 ft (48.8 m) long with a longest span of 80 ft (24.4 m) and a deck 46 ft wide.

Who owns SH 43 over Blackwell Lake Slough?

It is owned by the State Highway Agency.