US 79 over Onion Creek
FairWilliamson County, Texas · 0.8 MI E of IH 35 · Structure no. 142460020401071
- Built
- 1989
- 36 years old
- Condition
- Fair
- inspected January 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 120 ft
- 2 main spans
- Daily traffic
- 45,039
- 2021 count
- Owner
- State
- State Highway Agency
About this bridge
US 79 over Onion Creek is a prestressed concrete stringer/multi-beam or girder carrying US 79 over Onion Creek in Williamson County, Texas. It was built in 1989, so it is 36 years old, younger 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 45,039 vehicles a day, roughly 6% of them trucks, projected to reach 72,963 by 2041. The structure is 120 ft (36.6 m) long and 98 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 79 over Onion Creek built?
It was built in 1989, making it 36 years old in 2025.
What condition is US 79 over Onion 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 January 2023.
How much traffic does US 79 over Onion Creek carry?
About 45,039 vehicles per day (2021 count), of which roughly 6% are trucks.
How long is US 79 over Onion Creek?
The structure is 120 ft (36.6 m) long with a longest span of 60 ft (18.3 m) and a deck 98 ft wide.
Who owns US 79 over Onion Creek?
It is owned by the State Highway Agency.