500 N Egan Ave over Madison Ck
Lake County, South Dakota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 500 N Egan Ave over Madison Ck in Lake County, South Dakota, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1993, making it 32 years old at the 2025 inventory.
- It carries about 3,190 vehicles a day (traffic count year 2022).
- Its listed owner is a city or municipal highway agency.
- It is one of 40 of the 79 inventoried bridges in Lake County rated fair (50.6%); 4 (5.1%) are rated poor.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (44.00926, -97.11394)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 38 ft |
| Location | Egan Ave N - Madison |
| NBI structure number | 000000040128129 |
| Condition class | Fair |
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 |
| 610 S. Egan Avenue over Silver Ck | 1979 | 2,915 | Fair |
| SD019 over Park Ck | 2014 | 2,881 | Good |
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.