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FM over Drainage Ditch

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

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

FM over Drainage Ditch in Hamilton County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
It was built in 1960, making it 65 years old at the 2025 inventory.
It carries about 319 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 32 of the 165 inventoried bridges in Hamilton County rated poor (19.4%); 32 (19.4%) 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	Prestressed concrete stringer or multi-beam girder
Length	about 55 ft
Location	089231006
NBI structure number	000000000172110
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
I 35 over Drainage Ditch	1966	27,200	Fair
I 35 over Stream	1965	26,900	Good
I-35 over Tuttle Creek	1967	17,400	Fair
I-35 over Drainage Ditch 23 & 31	1972	16,600	Good
I 35 NB over Ia 175	1966	11,850	Fair
I 35 SB over Ia 175	1966	11,850	Fair