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SR 18/SR 145 over Chickasawhay River

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

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

SR 18/SR 145 over Chickasawhay River in Clarke County, Mississippi, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1956, making it 69 years old at the 2025 inventory.
It carries about 5,700 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 100 of the 222 inventoried bridges in Clarke County rated fair (45.0%); 14 (6.3%) 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 steel stringer or multi-beam girder
Length	about 761 ft
Location	0.3 Mi N SR 18 W
NBI structure number	210004501204540
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I 59 over Allen Branch	1965	14,000	Fair
I 59 over Stream	1965	13,000	Fair
US 45 over Stream	1999	8,000	Good
I 59 over SR 18	1965	7,000	Good
I 59 over SR 18	1965	7,000	Good
I 59 over Stream	1965	7,000	Good