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Ia 21 over South Skunk River

Keokuk County, Iowa · rated Fair in the 2025 National Bridge Inventory

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

Ia 21 over South Skunk River in Keokuk County, Iowa, 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 1989, making it 36 years old at the 2025 inventory.
It carries about 630 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 88 of the 183 inventoried bridges in Keokuk County rated fair (48.1%); 37 (20.2%) 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	Prestressed concrete stringer or multi-beam girder
Length	about 481 ft
Location	1.0 mi. S of SR G-48
NBI structure number	000000000211161
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Ia 92 over Rock Creek	1964	3,400	Fair
Ia 92 & 149 over Bridge Creek	1967	3,110	Fair
Ia 149 over North Skunk River	1986	2,540	Fair
Ia 21 over Coal Creek	1969	2,300	Fair
Ia 23 over Stream	1976	1,980	Fair
Ia 21 over Stream	1940	1,950	Fair