N137 over Niobrara River
Rock County, Nebraska · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- N137 over Niobrara River in Rock County, Nebraska, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 7 (good condition) on the 0-9 scale.
- It was built in 1974, making it 51 years old at the 2025 inventory.
- It carries about 430 vehicles a day (traffic count year 2018).
- Its listed owner is the state highway agency.
- It is one of 8 of the 14 inventoried bridges in Rock County rated good (57.1%); 1 (7.1%) 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 2023, on a 24-month routine inspection cycle.
- 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 → (42.7809, -99.3346)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 9 | 9 | Excellent condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 363 ft |
| Location | 13N Newport |
| NBI structure number | S137 01328 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 7: scour countermeasures installed |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Nebraska department of transportation.
Busiest bridges in Rock County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US20/US183/N7 over Abandoned RR | 1938 | 2,860 | Good |
| N137 over N Br Elkhorn River | 1973 | 430 | Good |
| N7 over Niobrara River | 1982 | 395 | Good |
| 889TH Rd over Long Pine Creek | 2020 | 45 | Good |
| 449TH Ave over Laughing Water Creek | 2002 | 45 | Good |
| County Highway over Skull Creek | 1969 | 35 | Fair |
All bridges nearby: Rock County, NE bridge conditions · every bridge in Rock County · Nebraska bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.