Home › Iowa › Delaware County › X 35 (270TH Ave) over US 20

X 35 (270TH Ave) over US 20

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

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

X 35 (270TH Ave) over US 20 in Delaware 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 6 (satisfactory condition) on the 0-9 scale.
It was built in 1987, making it 38 years old at the 2025 inventory.
It carries about 1,041 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 160 of the 294 inventoried bridges in Delaware County rated fair (54.4%); 20 (6.8%) 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


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 248 ft
Location	3.7 mi. E of Jct. IA #38
NBI structure number	000000000605730
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 20 over Stream	1963	9,700	Fair
US 20 over Stream	1963	9,000	Good
US 20 over Drainage Ditch	1963	9,000	Fair
Ia 13 over Maquoketa River	1991	7,900	Good
Ia 13 over US 20	1970	6,400	Fair
W Marion St over Maquoketa River	1980	6,294	Poor