US 77 over Mixon Creek

Fair

Lavaca County, Texas · 1.60 MI S of FM 532E · Structure no. 131430026902004

Built: 1925; 100 years old, rebuilt 1956
Condition: Fair; inspected March 2023
Type: Tee Beam; Concrete
Length: 156 ft; 4 main spans
Daily traffic: 5,158; 2020 count
Owner: State; State Highway Agency

About this bridge

US 77 over Mixon Creek is a concrete tee beam carrying US 77 over Mixon Creek in Lavaca County, Texas. It was built in 1925 and reconstructed in 1956, so it is 100 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 5,158 vehicles a day, roughly 14% of them trucks, projected to reach 8,460 by 2038. The structure is 156 ft (47.5 m) long and 42 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesUS 77

CrossesMixon Creek

Location1.60 MI S of FM 532E

RouteU.S. Route 77

CountyLavaca County

StateTexas

Coordinates29.53537, -96.91142

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.

Component	Rating	Meaning
Deck	7 Good	Some minor problems.
Superstructure	7 Good	Some minor problems.
Substructure	6 Satisfactory	Structural elements show some minor deterioration.
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionMarch 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour within limits of footing or piles

Structural evaluation6: Equal to present minimum criteria

Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is

Waterway adequacy6: Equal to present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating55 US tons

Inventory rating33 US tons

Structure

Structure typeTee Beam

MaterialConcrete

DeckConcrete, cast-in-place

Main spans4

Design loadH 15

Structure length156 ft (47.5 m)

Longest span39 ft (11.9 m)

Deck width42 ft (12.8 m)

Roadway width40 ft (12.2 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,158 (2020)

Projected traffic8,460 by 2038

Trucks14%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed3.7 mi (6 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 US 77 over Mixon Creek built?

It was built in 1925, making it 100 years old in 2025. It was reconstructed in 1956.

What condition is US 77 over Mixon Creek 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 March 2023.

How much traffic does US 77 over Mixon Creek carry?

About 5,158 vehicles per day (2020 count), of which roughly 14% are trucks.

How long is US 77 over Mixon Creek?

The structure is 156 ft (47.5 m) long with a longest span of 39 ft (11.9 m) and a deck 42 ft wide.

Who owns US 77 over Mixon Creek?

It is owned by the State Highway Agency.