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FM over Drainage

Mahaska County, Iowa · rated Poor in the 2025 National Bridge Inventory

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

FM over Drainage in Mahaska County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 3 (serious condition) on the 0-9 scale.
It was built in 1951, making it 74 years old at the 2025 inventory.
It carries about 35 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 67 of the 221 inventoried bridges in Mahaska County rated poor (30.3%); 67 (30.3%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 55 ft
Location	076152401
NBI structure number	000000000237340
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
US 63 over Nenebec Creek	1998	12,500	Fair
Ia 163 over Muchakinok Creek	1997	12,200	Fair
Ia 163 over Little Muchikinock Creek	1995	7,800	Fair
US 63 over Little Muchakinock Creek	1963	6,600	Fair
Ia 92 over Spring Creek/pedestrian	1958	6,400	Fair
US 63 over Stream	1982	6,350	Good