N4120 over Mormon Creek
PoorNowata County, Oklahoma · 4.0 MI NW of 60 · Structure no. 202500000000000
- Built
- 1982
- 43 years old
- Condition
- Poor
- inspected May 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 100 ft
- 2 main spans
- Daily traffic
- 100
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
N4120 over Mormon Creek is a prestressed concrete tee beam carrying N4120 over Mormon Creek in Nowata County, Oklahoma. It was built in 1982, so it is 43 years old, younger than the Oklahoma average of 47.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 100 vehicles a day, roughly 10% of them trucks, projected to reach 160 by 2042. The structure is 100 ft (30.5 m) long and 28 ft wide. If it were closed, the detour would be 7.5 mi (12 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Channel and channel protection | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was N4120 over Mormon Creek built?
It was built in 1982, making it 43 years old in 2025.
What condition is N4120 over Mormon Creek in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.
How much traffic does N4120 over Mormon Creek carry?
About 100 vehicles per day (2022 count), of which roughly 10% are trucks.
How long is N4120 over Mormon Creek?
The structure is 100 ft (30.5 m) long with a longest span of 50 ft (15.2 m) and a deck 28 ft wide.
Who owns N4120 over Mormon Creek?
It is owned by the County Highway Agency.