FM 521 over Mustang Bayou
GoodFort Bend County, Texas · 3.85 MI S of FM 2234 · Structure no. 120800011103026
- Built
- 1949
- 76 years old
- Condition
- Good
- inspected September 2024
- Type
- Culvert
- Concrete
- Length
- 38 ft
- 5 main spans
- Daily traffic
- 17,417
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
FM 521 over Mustang Bayou is a concrete culvert carrying FM 521 over Mustang Bayou in Fort Bend County, Texas. It was built in 1949, so it is 76 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 17,417 vehicles a day, roughly 8% of them trucks, projected to reach 21,597 by 2042. The structure is 38 ft (11.6 m) long and 41 ft wide. If it were closed, the detour would be 14.3 mi (23 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 | 8 Very Good | No problems noted. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was FM 521 over Mustang Bayou built?
It was built in 1949, making it 76 years old in 2025.
What condition is FM 521 over Mustang Bayou 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 September 2024.
How much traffic does FM 521 over Mustang Bayou carry?
About 17,417 vehicles per day (2023 count), of which roughly 8% are trucks.
How long is FM 521 over Mustang Bayou?
The structure is 38 ft (11.6 m) long with a longest span of 7 ft (2.1 m) and a deck 41 ft wide.
Who owns FM 521 over Mustang Bayou?
It is owned by the State Highway Agency.