FM 646 over Dickinson Bayou
GoodGalveston County, Texas · 0.35 MI S of FM 517 · Structure no. 120850097801055
- Built
- 2013
- 12 years old
- Condition
- Good
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 220 ft
- 3 main spans
- Daily traffic
- 14,010
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
FM 646 over Dickinson Bayou is a prestressed concrete stringer/multi-beam or girder carrying FM 646 over Dickinson Bayou in Galveston County, Texas. It was built in 2013, so it is 12 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 14,010 vehicles a day, roughly 4% of them trucks, projected to reach 14,280 by 2030. The structure is 220 ft (67.1 m) long and 80 ft wide. If it were closed, the detour would be 5 mi (8 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was FM 646 over Dickinson Bayou built?
It was built in 2013, making it 12 years old in 2025.
What condition is FM 646 over Dickinson 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 August 2024.
How much traffic does FM 646 over Dickinson Bayou carry?
About 14,010 vehicles per day (2020 count), of which roughly 4% are trucks.
How long is FM 646 over Dickinson Bayou?
The structure is 220 ft (67.1 m) long with a longest span of 90 ft (27.4 m) and a deck 80 ft wide.
Who owns FM 646 over Dickinson Bayou?
It is owned by the State Highway Agency.