State Route 121 over Tulucay Creek
Napa County, California · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- State Route 121 over Tulucay Creek in Napa County, California, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1918 and reconstructed in 1944, making it 107 years old at the 2025 inventory.
- It carries about 22,850 vehicles a day (traffic count year 2009).
- Its listed owner is the state highway agency.
- It is one of 81 of the 160 inventoried bridges in Napa County rated fair (50.6%); 8 (5.0%) 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 April 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 → (38.28663, -122.27465)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete tee beam |
| Length | about 44 ft |
| Location | 04-nap-121-6.42-nap |
| NBI structure number | 21 0003 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 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 Napa County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| State Route 29 over State Route 221 (soscol) | 2024 | 79,300 | Good |
| State Route 29 over American Canyon Creek | 1943 | 48,000 | Fair |
| State Route 29 over Nvrr Napa River Stanly | 1977 | 48,000 | Poor |
| State Route 29 over Stanley Creek | 1981 | 48,000 | Fair |
| State Route 29 over Dry Creek | 1970 | 43,000 | Fair |
| St Rte 29 Byway E over Craig Creek | 1958 | 43,000 | Good |
All bridges nearby: Napa County, CA bridge conditions · every bridge in Napa County · California bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.