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Herber Rd over Little Maquoketa River

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

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

Herber Rd over Little Maquoketa River in Dubuque County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 7 (good condition) on the 0-9 scale.
It was built in 2015, making it 10 years old at the 2025 inventory.
It carries about 1,910 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 180 of the 346 inventoried bridges in Dubuque County rated good (52.0%); 25 (7.2%) 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 576 ft
Location	090e22604
NBI structure number	000000000148051
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
US 20 over N Branch Catfish Creek	1939	33,600	Fair
US 61 & 151 over Peosta Chl & City St	1991	22,300	Fair
US 61 & 151 over Mississippi River Island	1982	20,400	Fair
US 20 US 52 over Drainage Ditch	1957	18,500	Fair
US 20 over Miss. River Hwy & RR	1943	17,700	Fair
EB US 20 over Mid Br Catfish Ck Cc RR	1995	14,300	Good