SH 21 over Knox Branch
GoodLee County, Texas · 4.7 MI E of SH 77 · Structure no. 141440011601028
- Built
- 1939
- 86 years old, rebuilt 1971
- Condition
- Good
- inspected December 2024
- Type
- Culvert
- Concrete
- Length
- 41 ft
- 6 main spans
- Daily traffic
- 8,454
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SH 21 over Knox Branch is a concrete culvert carrying SH 21 over Knox Branch in Lee County, Texas. It was built in 1939 and reconstructed in 1971, so it is 86 years old, older than the Texas average of 44.4 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 8,454 vehicles a day, roughly 18% of them trucks, projected to reach 11,836 by 2042. The structure is 41 ft (12.5 m) long. If it were closed, the detour would be 9.9 mi (16 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 21 over Knox Branch built?
It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1971.
What condition is SH 21 over Knox Branch in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2024.
How much traffic does SH 21 over Knox Branch carry?
About 8,454 vehicles per day (2023 count), of which roughly 18% are trucks.
How long is SH 21 over Knox Branch?
The structure is 41 ft (12.5 m) long with a longest span of 6 ft (1.8 m).
Who owns SH 21 over Knox Branch?
It is owned by the State Highway Agency.