Irr SD010 over Clear Lake Inlet
Marshall County, South Dakota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr SD010 over Clear Lake Inlet in Marshall County, South Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
- It was built in 1993, making it 32 years old at the 2025 inventory.
- It carries about 692 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 7 of the 38 inventoried bridges in Marshall County rated good (18.4%); 13 (34.2%) 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 → (45.69526, -97.34112)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 24 ft |
| Location | 3 SE Jct Sd 25 N |
| NBI structure number | 000000046305166 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Marshall County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SD010 over Crow Ck | 1942 | 1,344 | Fair |
| SD010 over Drainage Ditch | 1948 | 945 | Fair |
| SD027 over Trib Spain Ditch | 1959 | 613 | Fair |
| SD027 over Dry Run Ck | 1980 | 601 | Fair |
| SD027 over Ck | 1980 | 601 | Fair |
| SD027 over Spain Ditch | 1977 | 601 | Fair |
All bridges nearby: Marshall County, SD bridge conditions · every bridge in Marshall County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.