Dillon Road over Whitewater River
Riverside County, California · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Dillon Road over Whitewater River in Riverside 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 1950 and reconstructed in 1969, making it 75 years old at the 2025 inventory.
- It carries about 8,700 vehicles a day (traffic count year 2014).
- Its listed owner is a city or municipal highway agency.
- It is one of 18 of the 1,120 inventoried bridges in Riverside County rated poor (1.6%); 18 (1.6%) 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 November 2024, on a 12-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 → (33.70634, -116.18309)
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 | Prestressed concrete multiple box beam |
| Length | about 278 ft |
| Location | 0.12 Mi. Se/o SR 86S |
| NBI structure number | 56C0318 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | November 2024 |
| Inspection interval (item 91) | 12 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 Riverside County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| State Route 91 over BNSF Ry Amtrak Metrolink | 1970 | 270,000 | Fair |
| State Route 91 over Serfas Drive | 1970 | 269,000 | Good |
| Route 91 over Buena Vista Avenue | 1961 | 268,000 | Fair |
| State Route 91 over E91-n71 Connctr (future) | 1970 | 267,000 | Good |
| State Route 91 over Coal Canyon | 1970 | 264,000 | Good |
| State Route 91 over State Route 71 | 1970 | 264,000 | Good |
All bridges nearby: Riverside County, CA bridge conditions · every bridge in Riverside County · California bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.