SH 146 over Irrigation Canal
Chambers County, Texas · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SH 146 over Irrigation Canal in Chambers County, Texas, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1944 and reconstructed in 1990, making it 81 years old at the 2025 inventory.
- It carries about 15,026 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 69 of the 159 inventoried bridges in Chambers County rated fair (43.4%); 3 (1.9%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated good in the 2024 inventory and is now fair (culvert 7 to 6).
- Its most recent inspection on record is dated June 2024, 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 → (29.86681, -94.89335)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 7 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 46 ft |
| Location | 3.2 Mi N of Ih 10 |
| NBI structure number | 200360038902031 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | June 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Texas department of transportation.
Busiest bridges in Chambers County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ih 10 Ml over Cedar Bayou | 1999 | 104,824 | Good |
| Ih 10 over SH 99 & Hackberry Gully | 2007 | 86,090 | Fair |
| Ih 10 over Barbers Canal | 1948 | 84,431 | Good |
| Ih 10 over SH 146 | 2000 | 84,431 | Good |
| Ih 10 over Cotton Bayou | 2000 | 84,431 | Good |
| Ih 10 over FM 3180 | 2020 | 84,431 | Good |
All bridges nearby: Chambers County, TX bridge conditions · every bridge in Chambers County · Texas bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.