Avenue 18.5 over Eastside Bypass Channel
Madera County, California · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Avenue 18.5 over Eastside Bypass Channel in Madera County, California, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 3 (serious condition) on the 0-9 scale.
- It was built in 1965, making it 60 years old at the 2025 inventory.
- It carries about 300 vehicles a day (traffic count year 2020).
- Its listed owner is the county highway agency.
- It is one of 24 of the 250 inventoried bridges in Madera County rated poor (9.6%); 24 (9.6%) are rated poor.
- Its traffic status in the 2025 inventory is closed to all traffic (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated March 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 → (37.01817, -120.43425)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 3 | 3 | Serious condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 317 ft |
| Location | 2.0 Mi East of Road 4 |
| NBI structure number | 41C0089 |
| Condition class | Poor |
| Traffic status (item 41) | Closed to all traffic |
| Last inspection (item 90) | March 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 Madera County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| State Route 99 over Fresno River | 1989 | 68,000 | Good |
| State Route 99 over Little Dry Creek | 1912 | 67,000 | Fair |
| State Route 99 over SR 99 | 1973 | 65,000 | Good |
| State Route 99 over San Joaquin River | 2015 | 64,000 | Fair |
| State Route 99 over Berenda Creek | 1949 | 56,000 | Fair |
| State Route 99 over Chowchilla River | 1995 | 37,500 | Fair |
All bridges nearby: Madera County, CA bridge conditions · every bridge in Madera County · California bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.