N1820 over Sulphur Creek
GoodHarmon County, Oklahoma · 1.2 N 7.3 E of Vinson · Structure no. 227800000000000
- Built
- 1991
- 34 years old
- Condition
- Good
- inspected February 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 55 ft
- 1 main span
- Daily traffic
- 60
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
N1820 over Sulphur Creek is a prestressed concrete tee beam carrying N1820 over Sulphur Creek in Harmon County, Oklahoma. It was built in 1991, so it is 34 years old, younger than the Oklahoma average of 47.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 60 vehicles a day, roughly 10% of them trucks, projected to reach 96 by 2042. The structure is 55 ft (16.8 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was N1820 over Sulphur Creek built?
It was built in 1991, making it 34 years old in 2025.
What condition is N1820 over Sulphur Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2024.
How much traffic does N1820 over Sulphur Creek carry?
About 60 vehicles per day (2022 count), of which roughly 10% are trucks.
How long is N1820 over Sulphur Creek?
The structure is 55 ft (16.8 m) long with a longest span of 53 ft (16.2 m) and a deck 28 ft wide.
Who owns N1820 over Sulphur Creek?
It is owned by the County Highway Agency.