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US 63 S over US 63C Cst Conley Rd

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

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

US 63 S over US 63C Cst Conley Rd in Boone County, Missouri, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1993, making it 32 years old at the 2025 inventory.
It carries about 12,240 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 156 of the 335 inventoried bridges in Boone County rated fair (46.6%); 12 (3.6%) 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	Continuous prestressed concrete stringer or multi-beam girder
Length	about 255 ft
Location	S 8 T 48 N R 12 W
NBI structure number	3364
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Is 70 E over Lp 70	2015	63,178	Good
Is 70 E over Hominy CR	1983	53,537	Good
Is 70 E over Grindstone CR	1949	47,500	Fair
Is 70 E over Sugar Br	1958	40,417	Fair
US 63 S over Mo 740	1976	38,962	Fair
US 63 S over Hominy CR	2005	38,962	Good