Tower Drive over US016
Pennington County, South Dakota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Tower Drive over US016 in Pennington 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 1964, making it 61 years old at the 2025 inventory.
- It carries about 600 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 206 of the 348 inventoried bridges in Pennington County rated fair (59.2%); 21 (6.0%) are rated poor.
- 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 → (44.05591, -103.23193)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 5 | Fair condition |
| Superstructure | 7 | Good condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 294 ft |
| Location | 1.9 S Jct Sd 44 E |
| NBI structure number | 000000052410318 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Pennington County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I090 over Boxelder Ck | 1994 | 26,980 | Good |
| Cambell St over Ck | 1964 | 23,179 | Fair |
| SD079NF over St Joseph St Rcp&e RR | 1964 | 23,179 | Fair |
| Cambell St over Rapid Ck | 1967 | 21,415 | Fair |
| West Main St. over Rapid Ck | 1975 | 20,745 | Good |
| SD231 over Rapid Ck | 1974 | 20,057 | Fair |
All bridges nearby: Pennington County, SD bridge conditions · every bridge in Pennington County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.