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Ch 15 over E Fk Mazonriver

Grundy County, Illinois · rated Poor in the 2025 National Bridge Inventory

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

Ch 15 over E Fk Mazonriver in Grundy County, Illinois, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 2 (critical condition) on the 0-9 scale.
It was built in 1977, making it 48 years old at the 2025 inventory.
It carries about 1,350 vehicles a day (traffic count year 2024).
Its listed owner is the county highway agency.
It is one of 76 of the 268 inventoried bridges in Grundy County rated poor (28.4%); 76 (28.4%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Prestressed concrete multiple box beam
Length	about 196 ft
Location	0.05 Mi W Ch 16
NBI structure number	032333500000000
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
Fai 80 (EB & WB) over Fas285/ch5/ridge Rd	2003	50,300	Fair
Fai 080 (EB & WB) over Walley Run CR	2003	39,100	Good
Fai 80 (EB & WB) over Aux Sable Crk	2003	39,100	Fair
Fai 80 (EB & WB) over Collins Run Creek	2003	39,100	Good
Fai-55 & Or 66 over Woods Run	1979	24,300	Good
I-55 over Brewster Run	1979	22,900	Good