SD036EF (cord #11) over Grace Coolidge Ck
Custer County, South Dakota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SD036EF (cord #11) over Grace Coolidge Ck in Custer 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 2001, making it 24 years old at the 2025 inventory.
- It carries about 570 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 47 of the 94 inventoried bridges in Custer County rated good (50.0%); 5 (5.3%) 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 → (43.78199, -103.3056)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 8 | Very good condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 24 ft |
| Location | 4 Mi S. & 5.3 W. Hermosa |
| NBI structure number | 000000017377059 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Custer County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US016 over French Ck | 1966 | 10,052 | Fair |
| US016 over Ck | 1966 | 10,052 | Good |
| US016A over Laughing Water Ck | 1964 | 6,829 | Good |
| SD079 over Battle Ck | 1997 | 6,610 | Good |
| US016 over French Ck | 1974 | 3,709 | Fair |
| US016 over French Ck | 1974 | 3,709 | Fair |
All bridges nearby: Custer County, SD bridge conditions · every bridge in Custer County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.