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US 18 over Waterman Creek

O'Brien County, Iowa · rated Good in the 2025 National Bridge Inventory

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

US 18 over Waterman Creek in O'Brien County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 2020, making it 5 years old at the 2025 inventory.
It carries about 3,530 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 128 of the 263 inventoried bridges in O'Brien County rated good (48.7%); 16 (6.1%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 204 ft
Location	1.3 Mi. W. of SR M12
NBI structure number	000000000038241
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
Ia 60 over Engels Creek	2006	5,300	Good
US 18 over Branch Little Floyd Rvr	1958	4,530	Fair
US 18 over Drainage Ditch	1958	4,530	Fair
US 18 over Little Floyd River	1957	4,230	Fair
US 18 over Stream	1959	3,640	Fair
US 18 over Stream	1958	3,530	Fair