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Harmony Riley Road over Interstate 90

McHenry County, Illinois · rated Good in the 2025 National Bridge Inventory

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

Harmony Riley Road over Interstate 90 in McHenry County, Illinois, 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 2014, making it 11 years old at the 2025 inventory.
It carries about 1,450 vehicles a day (traffic count year 2021).
Its listed owner is the county highway agency.
It is one of 92 of the 227 inventoried bridges in McHenry County rated good (40.5%); 48 (21.1%) 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	Continuous steel stringer or multi-beam girder
Length	about 316 ft
Location	I-90 1M W of ILL 23
NBI structure number	056992300000000
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
Il 62 over Fox River	1988	43,100	Fair
Il 31 over RR - UP	1971	34,400	Fair
Algonquin Road over Woods Creek	2004	31,600	Fair
Algonquin Road over Crystal Creek	2004	31,600	Fair
Algonquin Road over Gravel Pit Creek	2004	31,600	Fair
Rakow Rd (ch V-29) over Crystal Creek	1994	30,600	Good