N21 over Platte River
Dawson County, Nebraska · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- N21 over Platte River in Dawson County, Nebraska, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 8 (very good condition) on the 0-9 scale.
- It was built in 1987, making it 38 years old at the 2025 inventory.
- It carries about 1,755 vehicles a day (traffic count year 2018).
- Its listed owner is the state highway agency.
- It is one of 203 of the 300 inventoried bridges in Dawson County rated good (67.7%); 11 (3.7%) 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 → (40.832, -99.9924)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 9 | Excellent condition |
| Superstructure | 8 | Very good condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 674 ft |
| Location | 1S Cozad |
| NBI structure number | S021 01167 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Nebraska department of transportation.
Busiest bridges in Dawson County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I80 over Spring Creek | 1963 | 18,660 | Fair |
| I80 over Spring Creek | 1963 | 18,660 | Fair |
| I80 over Stream | 1963 | 18,660 | Good |
| I80 over Mud Creek | 1963 | 18,660 | Good |
| I80 over Mud Creek | 1963 | 18,660 | Fair |
| I80 over Stream | 1935 | 18,485 | Good |
All bridges nearby: Dawson County, NE bridge conditions · every bridge in Dawson County · Nebraska bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.