FM 646 over Drainage Ditch
Galveston County, Texas · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- FM 646 over Drainage Ditch in Galveston County, Texas, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1969, making it 56 years old at the 2025 inventory.
- It carries about 18,730 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 142 of the 340 inventoried bridges in Galveston County rated fair (41.8%); 9 (2.6%) are rated poor.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (29.49063, -95.05567)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 5 | Fair condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 38 ft |
| Location | 0.50 Mi W of FM 1266 |
| NBI structure number | 120850304901002 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Texas department of transportation.
Busiest bridges in Galveston County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| IH 45 MLs & FRs over Clear Crk Trib | 1998 | 171,700 | Good |
| Ih 45 over FM 518 | 2020 | 144,300 | Good |
| Ih 45 Nbml over FM 646 | 2020 | 115,900 | Good |
| Ih 45 Sbml over FM 646 | 2020 | 115,900 | Good |
| Ih 45 Nbml over Magnolia Bayou | 2020 | 115,900 | Good |
| Ih 45 SB over Magnolia Bayou | 2022 | 115,900 | Good |
All bridges nearby: Galveston County, TX bridge conditions · every bridge in Galveston County · Texas bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.