SH 21 over Big Alum Creek
FairBastrop County, Texas · 1.6 MI E of FM 1441 · Structure no. 140110047201002
- Built
- 1934
- 91 years old, rebuilt 1966
- Condition
- Fair
- inspected November 2024
- Type
- Tee Beam
- Concrete
- Length
- 114 ft
- 4 main spans
- Daily traffic
- 9,910
- 2013 count
- Owner
- State
- State Highway Agency
About this bridge
SH 21 over Big Alum Creek is a concrete tee beam carrying SH 21 over Big Alum Creek in Bastrop County, Texas. It was built in 1934 and reconstructed in 1966, so it is 91 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 9,910 vehicles a day, roughly 12% of them trucks, projected to reach 13,880 by 2033. The structure is 114 ft (34.7 m) long and 54 ft wide. If it were closed, the detour would be 16.2 mi (26 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 | 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 21 over Big Alum Creek built?
It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1966.
What condition is SH 21 over Big Alum 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 November 2024.
How much traffic does SH 21 over Big Alum Creek carry?
About 9,910 vehicles per day (2013 count), of which roughly 12% are trucks.
How long is SH 21 over Big Alum Creek?
The structure is 114 ft (34.7 m) long with a longest span of 28 ft (8.5 m) and a deck 54 ft wide.
Who owns SH 21 over Big Alum Creek?
It is owned by the State Highway Agency.