66th Ave over Big Muddy Creek

Morton County, North Dakota · rated Good in the 2025 National Bridge Inventory

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

• 66th Ave over Big Muddy Creek in Morton County, North Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
• It was built in 1985, making it 40 years old at the 2025 inventory.
• It carries about 25 vehicles a day (traffic count year 2018).
• Its listed owner is the county highway agency.
• It is one of 115 of the 269 inventoried bridges in Morton County rated good (42.8%); 26 (9.7%) 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 → (46.81868, -101.84406)

Component ratings

Bridge details

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

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