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R70 580TH Ave over US 30

Story County, Iowa · rated Good in the 2025 National Bridge Inventory

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

R70 580TH Ave over US 30 in Story 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 2024, making it 1 years old at the 2025 inventory.
It carries about 1,490 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 102 of the 302 inventoried bridges in Story County rated good (33.8%); 40 (13.2%) are rated poor.
Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
It does not appear under this structure number in the 2024 inventory (a new or renumbered structure).
Its most recent inspection on record is dated October 2024, on a 24-month routine inspection cycle.
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 254 ft
Location	1.5 Mi. E. of 1-35 I-30
NBI structure number	000000000701070
Condition class	Good
Traffic status (item 41)	Open, no restriction
Last inspection (item 90)	October 2024
Inspection interval (item 91)	24 months
Scour (item 113)	N: not over a waterway

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

Bridge	Built	Vehicles/day	Condition
I-35 over Ballard Creek	1964	48,300	Fair
I-35 over Walnut Creek	1964	48,300	Fair
I 35 over South Skunk Rvr Overflow	2017	48,300	Good
I-35 over Drainage Ditch	1967	28,300	Good
US 69 over Ioway Creek	1924	24,600	Good
NB I-35 over Bike Path	1964	24,150	Fair