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Ch 9 (fas 580) over Mud Creek

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

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

Ch 9 (fas 580) over Mud Creek in Cass 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 8 (very good condition) on the 0-9 scale.
It was built in 2021, making it 4 years old at the 2025 inventory.
It carries about 525 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 24 of the 76 inventoried bridges in Cass County rated good (31.6%); 13 (17.1%) 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	Prestressed concrete multiple box beam
Length	about 110 ft
Location	1 Mi W Arenzville
NBI structure number	009303100000000
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
Il 125 over BNSF RR	1956	6,600	Fair
US 67 / Il 100 over Illinois River	1955	5,600	Poor
Il 125 over Lost Creek	2001	3,900	Good
Il 125 over Trib to Lost Creek	2009	3,500	Good
Il 125 over Trib to Lost Creek	2009	3,500	Good
Il 78 over Prairie Creek	1998	2,050	Good