Home › Iowa › Clayton County › US 18 & 52 over Branch Roberts Creek

US 18 & 52 over Branch Roberts Creek

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

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

US 18 & 52 over Branch Roberts Creek in Clayton County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1967, making it 58 years old at the 2025 inventory.
It carries about 4,140 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 141 of the 257 inventoried bridges in Clayton County rated fair (54.9%); 38 (14.8%) 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

Component	Rating (2025)	FHWA scale meaning
Culvert	6	Satisfactory condition


Structure	Continuous concrete culvert
Length	about 41 ft
Location	0.3 Mi. W of Jct. SR W64
NBI structure number	000000000020470
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 18 over Mississippi River Ia 76	1974	10,100	Fair
Ia 13 over Roberts Creek	1979	4,900	Good
Bridge St over Turkey River	1889	4,755	Fair
US 18 over Unnamed Creek	1988	4,730	Fair
US 18 over Bloody Run & Dme RR	1988	4,140	Fair
US 18 & 52 over Natural Stream	1967	3,780	Good