FM 3311 over Ih 20
Smith County, Texas · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- FM 3311 over Ih 20 in Smith County, Texas, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1964, making it 61 years old at the 2025 inventory.
- It carries about 746 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 218 of the 428 inventoried bridges in Smith County rated fair (50.9%); 3 (0.7%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated April 2023, on a 24-month routine inspection cycle.
- 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 → (32.44814, -95.18249)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 222 ft |
| Location | 0.35 Mi E of SH 155 |
| NBI structure number | 102120049505172 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Texas department of transportation.
Busiest bridges in Smith County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 69 over West Mud Creek | 1956 | 46,059 | Fair |
| Ih 20 over Rattlesnake Creek | 1961 | 38,914 | Fair |
| Sl 323 over W Mud CR Tr | 1956 | 38,634 | Fair |
| Ih 20 over Allen Branch Trib | 1961 | 38,112 | Fair |
| Ih 20 over Allen Branch | 1961 | 38,112 | Fair |
| Sl 323 over Indian Cr | 1956 | 36,533 | Fair |
All bridges nearby: Smith County, TX bridge conditions · every bridge in Smith County · Texas bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.