U.S. 56 over Drainage Canal Boisecity
Cimarron County, Oklahoma · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- U.S. 56 over Drainage Canal Boisecity in Cimarron 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 1951, making it 74 years old at the 2025 inventory.
- It carries about 4,000 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 41 of the 90 inventoried bridges in Cimarron County rated fair (45.6%); 1 (1.1%) are rated poor.
- 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 → (36.72151, -102.51372)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 45 ft |
| Location | .55S of Jct. US287 |
| NBI structure number | 125940000000000 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oklahoma department of transportation.
Busiest bridges in Cimarron County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| U.S. 56 over Creek | 1936 | 5,900 | Good |
| U.S. 56 over BNSF R.R. Under | 1988 | 4,600 | Fair |
| U.S. 287 over Adobe Draw | 2010 | 3,257 | Good |
| U.S. 287 over Cimarron Valley RR Under | 2011 | 2,700 | Fair |
| U.S. 287 over Creek | 1935 | 2,300 | Good |
| U.S. 287 over Creek | 1935 | 2,200 | Fair |
All bridges nearby: Cimarron County, OK bridge conditions · every bridge in Cimarron County · Oklahoma bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.