Allen Road over Kern River
Kern County, California · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Allen Road over Kern River in Kern County, California, 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 2009, making it 16 years old at the 2025 inventory.
- It carries about 12,766 vehicles a day (traffic count year 2015).
- Its listed owner is a city or municipal highway agency.
- It is one of 332 of the 668 inventoried bridges in Kern County rated good (49.7%); 37 (5.5%) 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 December 2021, on a 48-month routine inspection cycle.
- 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 → (35.34628, -119.14503)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 586 ft |
| Location | 0.5 Mi South of Stockdale |
| NBI structure number | 50C0353 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | December 2021 |
| Inspection interval (item 91) | 48 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 California department of transportation.
Busiest bridges in Kern County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| State Route 99 over Kern River | 1961 | 140,000 | Fair |
| State Route 99 over BNSF Ry & Amtrak | 1961 | 132,000 | Good |
| State Route 99 over California Avenue | 1963 | 132,000 | Good |
| State Route 99 over SR 178 (rosedale Hwy) | 1963 | 132,000 | Good |
| State Route 99 over Truxtun Ave | 1963 | 132,000 | Good |
| State Route 99 over Canal Lateral 29 | 1933 | 130,000 | Good |
All bridges nearby: Kern County, CA bridge conditions · every bridge in Kern County · California bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.