N4120 over Mormon Creek
Nowata County, Oklahoma · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- N4120 over Mormon Creek in Nowata County, Oklahoma, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 3 (serious condition) on the 0-9 scale.
- It was built in 1982, making it 43 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 14 of the 126 inventoried bridges in Nowata County rated poor (11.1%); 14 (11.1%) are rated poor.
- 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 → (36.75003, -95.66567)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 5 | Fair condition |
| Superstructure | 7 | Good condition |
| Substructure | 3 | Serious condition |
Bridge details
| Structure | Prestressed concrete tee beam |
| Length | about 100 ft |
| Location | 4.0 Mi NW of 60 |
| NBI structure number | 202500000000000 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oklahoma department of transportation.
Busiest bridges in Nowata County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| U.S. 169 over Creek | 1937 | 6,800 | Fair |
| U.S. 169 over Double Creek | 2002 | 5,800 | Good |
| U.S. 169 over Vineger Creek | 1962 | 5,700 | Fair |
| U.S. 169 over Opossum Creek | 2018 | 5,700 | Good |
| U.S. 169 over Opossum Creek Overflow | 2018 | 5,700 | Good |
| U.S. 169 over Double Creek | 2002 | 5,600 | Good |
All bridges nearby: Nowata County, OK bridge conditions · every bridge in Nowata County · Oklahoma bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.