Irr SD065 over Red Earth Ck
Ziebach County, South Dakota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr SD065 over Red Earth Ck in Ziebach County, South Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1984, making it 41 years old at the 2025 inventory.
- It carries about 580 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 7 of the 30 inventoried bridges in Ziebach County rated good (23.3%); 3 (10.0%) are rated poor.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (45.34146, -101.48637)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 7 | Good condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 93 ft |
| Location | 3.1 S Jct Sd 20 |
| NBI structure number | 000000069260092 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Ziebach County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Irr US212 over Ck | 1954 | 1,291 | Fair |
| Irr US212 over Bear Ck | 1954 | 1,130 | Fair |
| Irr US212 over Bear Ck | 1955 | 1,083 | Fair |
| Irr Bia Rte 6 over Ash Creek | 1968 | 814 | Good |
| Irr SD063 over Rudy Ck Tributary | 1994 | 590 | Fair |
| Irr SD063 over Rudey Ck | 1993 | 590 | Fair |
All bridges nearby: Ziebach County, SD bridge conditions · every bridge in Ziebach County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.