U.S. 59 SB over Grand Lake/sailboat
Delaware County, Oklahoma · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- U.S. 59 SB over Grand Lake/sailboat in Delaware County, Oklahoma, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1938 and reconstructed in 2001, making it 87 years old at the 2025 inventory.
- It carries about 5,200 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 76 of the 161 inventoried bridges in Delaware County rated fair (47.2%); 27 (16.8%) 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 August 2023, 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 → (36.63832, -94.81474)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous prestressed concrete segmental box girder |
| Length | about 3,043 ft |
| Location | 19.1 Mi N SH20 |
| NBI structure number | 065920000000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oklahoma department of transportation.
Busiest bridges in Delaware County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| S.H. 10 over Creek | 1946 | 11,300 | Fair |
| N4620 (2108C) over Creek | 2018 | 8,240 | Good |
| U.S. 59 over Drowning Creek | 1973 | 7,600 | Fair |
| U.S. 59 over Elm Branch Creek | 1925 | 7,300 | Fair |
| U.S. 59 over Honey Creek | 2002 | 7,300 | Fair |
| Cherokee Tp over Creek | 1991 | 6,300 | Good |
All bridges nearby: Delaware County, OK bridge conditions · every bridge in Delaware County · Oklahoma bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.