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County Rd 520 over Grass Waterway

Shelby County, Missouri · rated Fair in the 2025 National Bridge Inventory

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

County Rd 520 over Grass Waterway in Shelby County, Missouri, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1978, making it 47 years old at the 2025 inventory.
It carries about 30 vehicles a day (traffic count year 2024).
Its listed owner is the county highway agency.
It is one of 63 of the 106 inventoried bridges in Shelby County rated fair (59.4%); 11 (10.4%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 25 ft
Location	S 28 T 56 N R 12 W
NBI structure number	22912
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 36 E over Br of Crooked CR	1957	8,098	Fair
US 36 E over Brush CR	2007	7,990	Fair
US 36 W over Crooked CR	2007	5,289	Good
US 36 W over Rt Ff	2007	5,098	Good
US 36 W over N Fk Salt Rvr	1978	3,988	Fair
US 36 E over North Fk Salt Rvr	2007	3,911	Good