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Rt N S over Black CR

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

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

Rt N S over Black CR in Iron 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 1974 and reconstructed in 2004, making it 51 years old at the 2025 inventory.
It carries about 1,062 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 76 of the 126 inventoried bridges in Iron County rated fair (60.3%); 13 (10.3%) 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 168 ft
Location	S 35 T 34 N R 2 E
NBI structure number	1887
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Mo 21 S over Knob CR	1967	6,248	Fair
Old Rte 21 over Stouts CR	1926	4,000	Fair
Mo 21 S over Stouts CR	1967	3,870	Fair
Rt N N over UP RR	2007	3,718	Good
Rt N N over Indian CR	1932	3,718	Fair
Mo 21 S over Claybaugh CR	1985	3,513	Good