FM 646 over Highland Bayou
GoodGalveston County, Texas · 0.55 MI N of SH 6 · Structure no. 120850097801057
- Built
- 2017
- 8 years old
- Condition
- Good
- inspected September 2024
- Type
- Slab
- Prestressed Concrete
- Length
- 150 ft
- 3 main spans
- Daily traffic
- 12,843
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
FM 646 over Highland Bayou is a prestressed concrete slab carrying FM 646 over Highland Bayou in Galveston County, Texas. It was built in 2017, so it is 8 years old, younger 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 12,843 vehicles a day, roughly 2% of them trucks, projected to reach 11,600 by 2035. The structure is 150 ft (45.7 m) long and 81 ft wide. If it were closed, the detour would be 6.2 mi (10 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 |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was FM 646 over Highland Bayou built?
It was built in 2017, making it 8 years old in 2025.
What condition is FM 646 over Highland 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 646 over Highland Bayou carry?
About 12,843 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is FM 646 over Highland Bayou?
The structure is 150 ft (45.7 m) long with a longest span of 50 ft (15.2 m) and a deck 81 ft wide.
Who owns FM 646 over Highland Bayou?
It is owned by the State Highway Agency.