484TH Ave Hwy 109 over Four Mile Creek
Minnehaha County, South Dakota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 484TH Ave Hwy 109 over Four Mile Creek in Minnehaha County, South Dakota, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1962 and reconstructed in 2006, making it 63 years old at the 2025 inventory.
- It carries about 1,513 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 195 of the 394 inventoried bridges in Minnehaha County rated fair (49.5%); 36 (9.1%) 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 → (43.55189, -96.5321)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 5 | Fair condition |
| Superstructure | 5 | Fair condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 117 ft |
| Location | 3W & 2.3S Valley Springs |
| NBI structure number | 000000050300203 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Minnehaha County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I229 over Ck | 1959 | 43,830 | Fair |
| West 12TH Street over Big Sioux River | 1997 | 40,100 | Good |
| E 10TH St over I229 | 1995 | 35,954 | Fair |
| I229 over W 57TH St | 1995 | 34,780 | Good |
| I029 S over Skunk Ck | 1989 | 33,310 | Fair |
| I029 N over Skunk Ck | 1989 | 33,310 | Fair |
All bridges nearby: Minnehaha County, SD bridge conditions · every bridge in Minnehaha County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.