State Route 20 over Sutter Bypass
Sutter County, California · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- State Route 20 over Sutter Bypass in Sutter County, California, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1938 and reconstructed in 2000, making it 87 years old at the 2025 inventory.
- It carries about 7,600 vehicles a day (traffic count year 2009).
- Its listed owner is the state highway agency.
- It is one of 16 of the 121 inventoried bridges in Sutter County rated poor (13.2%); 16 (13.2%) 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.
- 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 → (39.14301, -121.84236)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 4 | 4 | Poor condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 4,148 ft |
| Location | 03-sut-020-4.22 |
| NBI structure number | 18 0005 |
| Condition class | Poor |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2023 |
| 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 Sutter County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| 5TH Street over Feather River | 2019 | 67,000 | Good |
| 5TH Street over 2ND Street Sutter Street | 2019 | 67,000 | Good |
| State Route 20 over Feather River K St UP RR | 1947 | 48,000 | Fair |
| State Route 20 over Abandoned UP RR Spur | 1946 | 41,750 | Good |
| State Route 20 over Sutter Street | 1946 | 41,750 | Good |
| State Route 99 SB over Cross Canal | 1949 | 18,750 | Fair |
All bridges nearby: Sutter County, CA bridge conditions · every bridge in Sutter County · California bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.