CR 4320 over Chiamon Bayou
San Augustine County, Texas · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- CR 4320 over Chiamon Bayou in San Augustine County, Texas, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 2015, making it 10 years old at the 2025 inventory.
- It carries about 55 vehicles a day (traffic count year 2015).
- Its listed owner is the county highway agency.
- It is one of 45 of the 94 inventoried bridges in San Augustine County rated good (47.9%); 0 (0.0%) are rated poor.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (31.35573, -94.07743)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 8 | Very good condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete slab |
| Length | about 40 ft |
| Location | 1.35 Mi SE of FM 1751 |
| NBI structure number | 112030AA0172001 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Texas department of transportation.
Busiest bridges in San Augustine County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SH 21 over RR & Ayish Byu & City St | 1984 | 5,300 | Fair |
| SH 103 over Attoyac Bayou | 1965 | 5,015 | Fair |
| SH 103 over Turkey Creek | 1954 | 4,123 | Good |
| SH 103 over Johnson Creek | 1950 | 3,359 | Fair |
| SH 21 over Perkins Creek | 2017 | 3,341 | Good |
| US 96 over Ayish Bayou | 2017 | 3,299 | Good |
All bridges nearby: San Augustine County, TX bridge conditions · every bridge in San Augustine County · Texas bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.