Koster Rd over Hospital Creek Overflow
San Joaquin County, California · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Koster Rd over Hospital Creek Overflow in San Joaquin County, California, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1947 and reconstructed in 2016, making it 78 years old at the 2025 inventory.
- It carries about 390 vehicles a day (traffic count year 2013).
- Its listed owner is the county highway agency.
- It is one of 372 of the 655 inventoried bridges in San Joaquin County rated fair (56.8%); 63 (9.6%) 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 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 → (37.60127, -121.32514)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete tee beam |
| Length | about 32 ft |
| Location | 0.5 Mi N Gaffery Rd |
| NBI structure number | 29C0374 |
| 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) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the California department of transportation.
Busiest bridges in San Joaquin County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Interstate 5 SB over Paradise Cut | 1947 | 143,000 | Fair |
| Interstate 5 NB over Brookside Calaveras Riv | 1968 | 124,000 | Poor |
| Interstate 5 NB over Country Club Blvd | 1970 | 124,000 | Fair |
| Interstate 5 NB over Michigan Ave | 1970 | 124,000 | Fair |
| Interstate 5 NB over Alpine Ave | 1970 | 124,000 | Fair |
| Interstate 5 NB over Telegraph Ave | 1970 | 124,000 | Fair |
All bridges nearby: San Joaquin County, CA bridge conditions · every bridge in San Joaquin County · California bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.