Hidden Timber Road over Antelope Ck
Todd County, South Dakota · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Hidden Timber Road over Antelope Ck in Todd County, South Dakota, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1951, making it 74 years old at the 2025 inventory.
- It carries about 128 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 7 of the 27 inventoried bridges in Todd County rated poor (25.9%); 7 (25.9%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated June 2023, on a 24-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (43.25187, -100.47145)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 4 | 4 | Poor condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 92 ft |
| Location | 9 E 3.8 S Mission |
| NBI structure number | 000000061390096 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | June 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Todd County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Irr US083 over Antelope Ck | 1981 | 2,544 | Fair |
| Irr Bia Rte 7 over Little White River | 1972 | 1,851 | Poor |
| Main Street over Antelope Ck | 1978 | 1,400 | Fair |
| Irr US018 over Little White Rv | 1989 | 1,340 | Fair |
| Irr US018 over Trib to Oak Ck | 2005 | 1,303 | Fair |
| Irr US018 over White Horse Ck | 2016 | 1,303 | Fair |
All bridges nearby: Todd County, SD bridge conditions · every bridge in Todd County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.