I029 over Nine Mile Ck
Lincoln County, South Dakota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I029 over Nine Mile Ck in Lincoln 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 1958, making it 67 years old at the 2025 inventory.
- It carries about 33,530 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 74 of the 207 inventoried bridges in Lincoln County rated good (35.7%); 32 (15.5%) 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 → (43.43571, -96.79624)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 8 | Very good condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 30 ft |
| Location | 4.5 S Minnehaha Co Line |
| NBI structure number | 000000042065047 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Lincoln County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I029 S over I229 S & I029 S Off Ramp | 2016 | 29,860 | Good |
| I029 N over I229 S & I029 S Off Ramp | 2016 | 29,860 | Good |
| S Louise Ave over I229 | 1993 | 24,586 | Fair |
| I029 S over 271 St - County Rd 106 | 2005 | 23,640 | Fair |
| I029 N over 271 St - County Rd 106 | 2005 | 23,640 | Good |
| Western Avenue over Creek | 2004 | 17,900 | Good |
All bridges nearby: Lincoln County, SD bridge conditions · every bridge in Lincoln County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.