SD040 over Iron Ck
FairPennington County, South Dakota · 5.3 E JCT US 16A · Structure no. 000000052357446
- Built
- 1974
- 51 years old
- Condition
- Fair
- inspected February 2025
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 152 ft
- 3 main spans
- Daily traffic
- 1,007
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
SD040 over Iron Ck is a steel continuous stringer/multi-beam or girder carrying SD040 over Iron Ck in Pennington County, South Dakota. It was built in 1974, so it is 51 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 1,007 vehicles a day, roughly 5% of them trucks, projected to reach 1,588 by 2044. The structure is 152 ft (46.4 m) long and 35 ft wide. If it were closed, the detour would be 9.9 mi (16 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SD040 over Iron Ck built?
It was built in 1974, making it 51 years old in 2025.
What condition is SD040 over Iron 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 February 2025.
How much traffic does SD040 over Iron Ck carry?
About 1,007 vehicles per day (2024 count), of which roughly 5% are trucks.
How long is SD040 over Iron Ck?
The structure is 152 ft (46.4 m) long with a longest span of 58 ft (17.7 m) and a deck 35 ft wide.
Who owns SD040 over Iron Ck?
It is owned by the State Highway Agency.