IRR SD020 over Irish Ck
GoodZiebach County, South Dakota · 7.5 E of Glad Valley · Structure no. 000000069195060
- Built
- 1975
- 50 years old
- Condition
- Good
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 157 ft
- 3 main spans
- Daily traffic
- 125
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
IRR SD020 over Irish Ck is a prestressed concrete continuous stringer/multi-beam or girder carrying IRR SD020 over Irish Ck in Ziebach County, South Dakota. It was built in 1975, so it is 50 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 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 125 vehicles a day, roughly 27% of them trucks, projected to reach 187 by 2044. The structure is 157 ft (48 m) long and 39 ft wide. If it were closed, the detour would be 44.1 mi (71 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 | 8 Very Good | No problems noted. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR SD020 over Irish Ck built?
It was built in 1975, making it 50 years old in 2025.
What condition is IRR SD020 over Irish Ck 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 September 2023.
How much traffic does IRR SD020 over Irish Ck carry?
About 125 vehicles per day (2024 count), of which roughly 27% are trucks.
How long is IRR SD020 over Irish Ck?
The structure is 157 ft (48 m) long with a longest span of 56 ft (17.1 m) and a deck 39 ft wide.
Who owns IRR SD020 over Irish Ck?
It is owned by the State Highway Agency.