N2640 over Barrow Drain
Alfalfa County, Oklahoma · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- N2640 over Barrow Drain in Alfalfa County, Oklahoma, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1969, making it 56 years old at the 2025 inventory.
- It carries about 100 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 258 of the 387 inventoried bridges in Alfalfa County rated fair (66.7%); 23 (5.9%) 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 → (36.97159, -98.30997)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 26 ft |
| Location | 3S of Ks 1W of SH 8 |
| NBI structure number | 173620000000000 |
| 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) | 7: scour countermeasures installed |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oklahoma department of transportation.
Busiest bridges in Alfalfa County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| U.S. 69 over Buck Creek | 2021 | 15,919 | Good |
| S.H. 11 over Unnamed Creek | 2020 | 2,800 | Good |
| U.S. 64 over Creek | 1927 | 2,700 | Fair |
| U.S. 64 over Creek | 1927 | 2,700 | Fair |
| U.S. 64 over West Clay Creek | 1972 | 2,700 | Fair |
| U.S. 64 over Lambert Creek | 1975 | 2,700 | Good |
All bridges nearby: Alfalfa County, OK bridge conditions · every bridge in Alfalfa County · Oklahoma bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.