Trappers Bay St Pk over Silver Lake Causeway
Dickinson County, Iowa · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Trappers Bay St Pk over Silver Lake Causeway in Dickinson County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1984, making it 41 years old at the 2025 inventory.
- It is one of 37 of the 83 inventoried bridges in Dickinson County rated good (44.6%); 13 (15.7%) are rated poor.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (43.45336, -95.33206)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 7 | Good condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete channel beam |
| Length | about 27 ft |
| Location | In Trappers Bay St.park |
| NBI structure number | 000000000699221 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Dickinson County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 71 over E to W Okoboji Lkes Conn | 1999 | 14,600 | Good |
| Ia 9 over Inlet W Okoboji Lake | 1971 | 8,500 | Fair |
| US 71 & Ia 9 over East Okoboji Lake | 1939 | 8,200 | Fair |
| US 71 & Ia 9 over Dry Run Creek | 1978 | 5,400 | Good |
| Ia 9 over W Fork Little Sioux Rvr | 1929 | 4,310 | Poor |
| Ia 9 over Little Sioux River | 1971 | 4,310 | Good |
All bridges nearby: Dickinson County, IA bridge conditions · every bridge in Dickinson County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.