SD028 over Dolph Ck
Hamlin County, South Dakota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SD028 over Dolph Ck in Hamlin 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 1949, making it 76 years old at the 2025 inventory.
- It carries about 1,233 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 28 of the 61 inventoried bridges in Hamlin County rated fair (45.9%); 7 (11.5%) 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 September 2023, on a 24-month routine inspection cycle.
- 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 → (44.58715, -97.29262)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 66 ft |
| Location | 3.7 W Jct Sd 21 N |
| NBI structure number | 000000029099150 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Hamlin County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I029 S over 462 Ave | 1973 | 4,595 | Fair |
| I029 N over 462 Ave | 1973 | 4,595 | Fair |
| I029 S over Stray Horse Ck | 1973 | 4,595 | Fair |
| I029 N over Stray Horse Ck | 1973 | 4,595 | Fair |
| I029 S over SD022 | 1973 | 4,595 | Fair |
| I029 N over SD022 | 1973 | 4,595 | Fair |
All bridges nearby: Hamlin County, SD bridge conditions · every bridge in Hamlin County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.