US Bridges

US 77 Bus NB over Marlin Branch

Fair

McLennan County, Texas · 0.8 MI N of Brazos River · Structure no. 091610001410123

Built
1958
67 years old
Condition
Fair
inspected December 2024
Type
Culvert
Concrete
Length
46 ft
6 main spans
Daily traffic
10,422
2023 count
Owner
State
State Highway Agency

About this bridge

US 77 Bus NB over Marlin Branch is a concrete culvert carrying US 77 Bus NB over Marlin Branch in McLennan County, Texas. It was built in 1958, so it is 67 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 10,422 vehicles a day, roughly 19% of them trucks, projected to reach 5,800 by 2030. The structure is 46 ft (14 m) long and 113 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesUS 77 Bus NB
CrossesMarlin Branch
Location0.8 MI N of Brazos River
RouteState Highway 77
CountyMcLennan County
StateTexas
Coordinates31.56283, -97.1029
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating26 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans6
Design loadOther
Structure length46 ft (14 m)
Longest span7 ft (2.1 m)
Deck width113 ft (34.5 m)
Roadway width67 ft (20.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,422 (2023)
Projected traffic5,800 by 2030
Trucks19%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$400,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US 77 Bus NB over Marlin Branch built?

It was built in 1958, making it 67 years old in 2025.

What condition is US 77 Bus NB over Marlin Branch 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 December 2024.

How much traffic does US 77 Bus NB over Marlin Branch carry?

About 10,422 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is US 77 Bus NB over Marlin Branch?

The structure is 46 ft (14 m) long with a longest span of 7 ft (2.1 m) and a deck 113 ft wide.

Who owns US 77 Bus NB over Marlin Branch?

It is owned by the State Highway Agency.