SD1804 over Okobojo Ck
FairSully County, South Dakota · 5.2 N Hughes CO Line · Structure no. 000000060130188
- Built
- 1972
- 53 years old
- Condition
- Fair
- inspected July 2024
- Type
- Slab
- Concrete Continuous
- Length
- 113 ft
- 3 main spans
- Daily traffic
- 632
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
SD1804 over Okobojo Ck is a concrete continuous slab carrying SD1804 over Okobojo Ck in Sully County, South Dakota. It was built in 1972, so it is 53 years old, older than the South Dakota average of 48.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 632 vehicles a day, roughly 15% of them trucks, projected to reach 1,103 by 2044. The structure is 113 ft (34.3 m) long and 33 ft wide. If it were closed, the detour would be 39.8 mi (64 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 8 Very Good | No problems noted. |
| 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 SD1804 over Okobojo Ck built?
It was built in 1972, making it 53 years old in 2025.
What condition is SD1804 over Okobojo Ck in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2024.
How much traffic does SD1804 over Okobojo Ck carry?
About 632 vehicles per day (2024 count), of which roughly 15% are trucks.
How long is SD1804 over Okobojo Ck?
The structure is 113 ft (34.3 m) long with a longest span of 40 ft (12.3 m) and a deck 33 ft wide.
Who owns SD1804 over Okobojo Ck?
It is owned by the State Highway Agency.