N137 over Niobrara River

Rock County, Nebraska · rated Good in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

• N137 over Niobrara River in Rock County, Nebraska, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• 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.
• 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

Bridge details

Source: FHWA National Bridge Inventory, 2025 data as reported by the Nebraska department of transportation.

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Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.