US Bridges

US 259 NB over Alligator Lake Slough

Good

Upshur County, Texas · 4.40 MI N of SH 155 · Structure no. 192300039202035

Built
1960
65 years old, rebuilt 1996
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
200 ft
5 main spans
Daily traffic
2,660
2020 count
Owner
State
State Highway Agency

About this bridge

US 259 NB over Alligator Lake Slough is a concrete stringer/multi-beam or girder carrying US 259 NB over Alligator Lake Slough in Upshur County, Texas. It was built in 1960 and reconstructed in 1996, so it is 65 years old, older 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 2,660 vehicles a day, roughly 14% of them trucks, projected to reach 6,580 by 2031. The structure is 200 ft (61 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 259 NB
CrossesAlligator Lake Slough
Location4.40 MI N of SH 155
RouteU.S. Route 259
StateTexas
Coordinates32.90207, -94.72739
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating34 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadOther
Structure length200 ft (61 m)
Longest span40 ft (12.2 m)
Deck width49 ft (14.9 m)
Roadway width48 ft (14.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,660 (2020)
Projected traffic6,580 by 2031
Trucks14%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 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 US 259 NB over Alligator Lake Slough built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1996.

What condition is US 259 NB over Alligator 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 July 2023.

How much traffic does US 259 NB over Alligator Lake Slough carry?

About 2,660 vehicles per day (2020 count), of which roughly 14% are trucks.

How long is US 259 NB over Alligator Lake Slough?

The structure is 200 ft (61 m) long with a longest span of 40 ft (12.2 m) and a deck 49 ft wide.

Who owns US 259 NB over Alligator Lake Slough?

It is owned by the State Highway Agency.