N57-w91 Conn Ramp over State Route 91
Orange County, California · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- N57-w91 Conn Ramp over State Route 91 in Orange County, California, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1974, making it 51 years old at the 2025 inventory.
- It carries about 15,410 vehicles a day (traffic count year 2014).
- Its listed owner is the state highway agency.
- It is one of 479 of the 1,181 inventoried bridges in Orange County rated fair (40.6%); 33 (2.8%) 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 January 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 → (33.84975, -117.87551)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete multiple box beam |
| Length | about 255 ft |
| Location | 12-ora-057-15.57-ana |
| NBI structure number | 55 0446G |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | January 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the California department of transportation.
Busiest bridges in Orange County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Interstate 405 over Bolsa Chica Ditch | 1959 | 374,000 | Fair |
| Route 5 over Route 55 | 1955 | 329,500 | Fair |
| Interstate 5 over La Paz Rd | 1959 | 327,000 | Fair |
| Interstate 5 over Red Hill Ave | 1992 | 324,300 | Fair |
| State Route 91 over Patt Drain #4 | 1959 | 319,000 | Good |
| State Route 91 over Patt Drain #5 | 1959 | 319,000 | Good |
All bridges nearby: Orange County, CA bridge conditions · every bridge in Orange County · California bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.