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County Rd 518 over Four Mile Pond Dtc

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

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

County Rd 518 over Four Mile Pond Dtc in Mississippi 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 2005, making it 20 years old at the 2025 inventory.
It carries about 50 vehicles a day (traffic count year 2024).
Its listed owner is the county highway agency.
It is one of 62 of the 99 inventoried bridges in Mississippi County rated fair (62.6%); 10 (10.1%) 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 multiple box beam
Length	about 111 ft
Location	S 21 T 24 N R 16 E
NBI structure number	30954
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Is 57 S over Ash Slu Dtch	1959	17,923	Fair
Is 57 S over Drain Dtch	1959	17,660	Fair
Is 57 S over Lateral Dtch #2	1959	15,417	Fair
Is 57 S over Mississippi Rvr	1976	11,453	Fair
Is 57 S over Lateral Dtch #2	1975	6,589	Fair
Is 57 S over Lateral Dtch #23	1974	6,589	Fair