US Bridges

Bus 77 Ml over Primrose Creek

Fair

McLennan County, Texas · 0.4 MI NE of IH 35 · Structure no. 091610001410322

Built
1931
94 years old, rebuilt 1964
Condition
Fair
inspected March 2023
Type
Culvert
Concrete
Length
37 ft
8 main spans
Daily traffic
4,485
2017 count
Owner
State
State Highway Agency

About this bridge

Bus 77 Ml over Primrose Creek is a concrete culvert carrying Bus 77 Ml over Primrose Creek in McLennan County, Texas. It was built in 1931 and reconstructed in 1964, so it is 94 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 4,485 vehicles a day, roughly 17% of them trucks, projected to reach 6,280 by 2037. The structure is 37 ft (11.3 m) long and 84 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesBus 77 Ml
CrossesPrimrose Creek
Location0.4 MI NE of IH 35
RouteState Highway 77
StateTexas
Coordinates31.52238, -97.13362
Functional classUrban Collector

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 inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
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
DeckConcrete, cast-in-place
Main spans8
Design loadH 15
Structure length37 ft (11.3 m)
Longest span4 ft (1.2 m)
Deck width84 ft (25.6 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,485 (2017)
Projected traffic6,280 by 2037
Trucks17%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Bus 77 Ml over Primrose Creek built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1964.

What condition is Bus 77 Ml over Primrose 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 Bus 77 Ml over Primrose Creek carry?

About 4,485 vehicles per day (2017 count), of which roughly 17% are trucks.

How long is Bus 77 Ml over Primrose Creek?

The structure is 37 ft (11.3 m) long with a longest span of 4 ft (1.2 m) and a deck 84 ft wide.

Who owns Bus 77 Ml over Primrose Creek?

It is owned by the State Highway Agency.