US081 over Ck
Lake County, South Dakota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US081 over Ck in Lake 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 1997, making it 28 years old at the 2025 inventory.
- It carries about 1,811 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 35 of the 79 inventoried bridges in Lake County rated good (44.3%); 4 (5.1%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated May 2024, on a 24-month routine inspection cycle.
- 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 → (44.0118, -97.20401)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 8 | 8 | Very good condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 21 ft |
| Location | 3.9 W Jct US 81 N |
| NBI structure number | 000000040083127 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Lake County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SD034 over Silver Ck | 2000 | 8,695 | Fair |
| 414 NE Second Str over Madison Ck | 1959 | 7,576 | Fair |
| SD034 W over Park Ck | 1977 | 3,631 | Fair |
| SD034 E over Park Ck | 1977 | 3,631 | Fair |
| 500 N Egan Ave over Madison Ck | 1993 | 3,190 | Fair |
| 610 S. Egan Avenue over Silver Ck | 1979 | 2,915 | Fair |
All bridges nearby: Lake County, SD bridge conditions · every bridge in Lake County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.