US018 over Red Canyon Ck
Fall River County, South Dakota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US018 over Red Canyon Ck in Fall River County, South Dakota, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1980, making it 45 years old at the 2025 inventory.
- It carries about 2,434 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 34 of the 80 inventoried bridges in Fall River County rated fair (42.5%); 5 (6.2%) 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 March 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 → (43.33462, -103.78883)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 181 ft |
| Location | 3 NE of Edgemont |
| NBI structure number | 000000024134099 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 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 Fall River County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US018 over Fall Rv | 2010 | 5,064 | Fair |
| US018 over Fall Rv | 2010 | 5,064 | Fair |
| US018 over Ck | 1968 | 4,913 | Fair |
| US385 over Fall Rv | 1998 | 4,898 | Good |
| US018 over Fall Rv | 1968 | 4,687 | Fair |
| SD079 over Elm Ck | 2006 | 4,214 | Fair |
All bridges nearby: Fall River County, SD bridge conditions · every bridge in Fall River County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.