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WB US 20 over R-38

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

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

WB US 20 over R-38 in Hamilton County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
It was built in 1975, making it 50 years old at the 2025 inventory.
It carries about 4,950 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 72 of the 165 inventoried bridges in Hamilton County rated fair (43.6%); 32 (19.4%) 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 138 ft
Location	at Junction With SR R38
NBI structure number	000000000603365
Condition class	Fair

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