US Bridges

BUS77 Sb/ SP484 SB over Marlin Branch

Fair

McLennan County, Texas · 1.0 MI SE of IH 35 · Structure no. 091610001410047

Built
1933
92 years old, rebuilt 1958
Condition
Fair
inspected January 2023
Type
Culvert
Concrete
Length
47 ft
7 main spans
Daily traffic
10,252
2011 count
Owner
State
State Highway Agency

About this bridge

BUS77 Sb/ SP484 SB over Marlin Branch is a concrete culvert carrying BUS77 Sb/ SP484 SB over Marlin Branch in McLennan County, Texas. It was built in 1933 and reconstructed in 1958, so it is 92 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 10,252 vehicles a day, roughly 6% of them trucks, projected to reach 13,130 by 2031. The structure is 47 ft (14.3 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesBUS77 Sb/ SP484 SB
CrossesMarlin Branch
Location1.0 MI SE of IH 35
RouteState Highway 77
CountyMcLennan County
StateTexas
Coordinates31.56254, -97.10352
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
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
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 spans7
Design loadH 15
Structure length47 ft (14.3 m)
Longest span6 ft (1.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,252 (2011)
Projected traffic13,130 by 2031
Trucks6%
Lanes on structure7
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes
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 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 BUS77 Sb/ SP484 SB over Marlin Branch built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1958.

What condition is BUS77 Sb/ SP484 SB 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 January 2023.

How much traffic does BUS77 Sb/ SP484 SB over Marlin Branch carry?

About 10,252 vehicles per day (2011 count), of which roughly 6% are trucks.

How long is BUS77 Sb/ SP484 SB over Marlin Branch?

The structure is 47 ft (14.3 m) long with a longest span of 6 ft (1.8 m).

Who owns BUS77 Sb/ SP484 SB over Marlin Branch?

It is owned by the State Highway Agency.