Home › Iowa › Humboldt County › FM over Dm River

FM over Dm River

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

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

FM over Dm River in Humboldt 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 1961, making it 64 years old at the 2025 inventory.
It carries about 559 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 46 of the 87 inventoried bridges in Humboldt County rated fair (52.9%); 7 (8.0%) 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 stringer or multi-beam girder
Length	about 250 ft
Location	091281904
NBI structure number	000000000184310
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 169 over W Fork Des Moines River	1997	7,100	Fair
US 169 over Indian Creek	2011	5,400	Good
Ia 3 over Stream	1939	4,590	Good
Sumner Ave SW over West Des Moines River	2015	3,472	Good
US 169 over Drainage Ditch	1985	3,220	Fair
US 169 over Bloody Run Creek	1985	3,220	Fair