Oak Hollow Dr over Onion Branch
Williamson County, Texas · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Oak Hollow Dr over Onion Branch in Williamson 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 1996, making it 29 years old at the 2025 inventory.
- It carries about 280 vehicles a day (traffic count year 2020).
- Its listed owner is a city or municipal highway agency.
- It is one of 363 of the 1,171 inventoried bridges in Williamson County rated fair (31.0%); 4 (0.3%) 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 September 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 → (30.53288, -97.70214)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 75 ft |
| Location | 0.10 Mi SE of FM 3406 |
| NBI structure number | 142460E00852001 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2023 |
| 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 Williamson County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ih 35 SB over South San Gabriel River | 1965 | 517,256 | Fair |
| Ih 35 Ml & Nbfr over Draw | 1960 | 209,037 | Fair |
| N Ih 35 Off Ramp over UPRR & Mcneil Rd | 2018 | 207,900 | Good |
| N Ih 35 on Ramp over UPRR & Mcneil Rd | 2018 | 207,900 | Good |
| Ih 35 over Lake Creek | 1960 | 160,231 | Fair |
| Ih 35 over McNEIL RD; UP RR; Etc | 1990 | 151,634 | Fair |
All bridges nearby: Williamson County, TX bridge conditions · every bridge in Williamson County · Texas bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.