Irr County Road over Trib to Little Moreau R
Dewey County, South Dakota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr County Road over Trib to Little Moreau R in Dewey County, South Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2008, making it 17 years old at the 2025 inventory.
- It carries about 10 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 15 of the 27 inventoried bridges in Dewey County rated good (55.6%); 4 (14.8%) 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 → (45.38564, -101.23209)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 8 | Very good condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 40 ft |
| Location | 3.0S 2.5E Firesteel |
| NBI structure number | 000000021136060 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Dewey County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Irr US212 over Little Bear Ck | 2023 | 1,291 | Good |
| Irr SD020 over Ck | 1997 | 890 | Good |
| Irr SD020 over Ck | 1997 | 890 | Good |
| Irr SD063 over Moreau Rv | 1971 | 717 | Fair |
| Irr US212 over Virgin Ck | 1990 | 601 | Good |
| Irr US212 over Virgin Ck | 1988 | 601 | Good |
All bridges nearby: Dewey County, SD bridge conditions · every bridge in Dewey County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.