SD025 over Roy Lk Inlet
Marshall County, South Dakota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SD025 over Roy Lk Inlet in Marshall County, South Dakota, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1959, making it 66 years old at the 2025 inventory.
- It carries about 523 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 18 of the 38 inventoried bridges in Marshall County rated fair (47.4%); 13 (34.2%) 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 July 2024, 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 → (45.68267, -97.41114)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 105 ft |
| Location | 2.5 S Jct Sd 10 |
| NBI structure number | 000000046276174 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2024 |
| 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 Marshall County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SD010 over Crow Ck | 1942 | 1,344 | Fair |
| SD010 over Drainage Ditch | 1948 | 945 | Fair |
| Irr SD010 over Clear Lake Inlet | 1993 | 692 | Good |
| SD027 over Trib Spain Ditch | 1959 | 613 | Fair |
| SD027 over Dry Run Ck | 1980 | 601 | Fair |
| SD027 over Ck | 1980 | 601 | Fair |
All bridges nearby: Marshall County, SD bridge conditions · every bridge in Marshall County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.