Chowchilla Road over Big Creek
Mariposa County, California · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Chowchilla Road over Big Creek in Mariposa County, California, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1940, making it 85 years old at the 2025 inventory.
- It carries about 20 vehicles a day (traffic count year 2019).
- It is one of 12 of the 109 inventoried bridges in Mariposa County rated poor (11.0%); 12 (11.0%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated September 2024, on a 24-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (37.51568, -119.66567)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 4 | 4 | Poor condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 41 ft |
| Location | Approx. 2.5 miles SW of W |
| NBI structure number | 8800016S0000000 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | September 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the California department of transportation.
Busiest bridges in Mariposa County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| State Route 140 over Mariposa Creek | 1932 | 10,800 | Fair |
| State Route 49 over Stockton Creek | 1967 | 7,900 | Fair |
| State Route 49 over Mariposa Creek | 1942 | 6,600 | Fair |
| State Route 140 over Miles Creek | 1916 | 4,650 | Fair |
| State Route 140 over Miles Creek | 1929 | 4,650 | Fair |
| State Route 140 over Miles Creek | 1928 | 4,650 | Fair |
All bridges nearby: Mariposa County, CA bridge conditions · every bridge in Mariposa County · California bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.