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Ill 336 NB over Rock Creek

Adams County, Illinois · rated Fair in the 2025 National Bridge Inventory

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

Ill 336 NB over Rock Creek in Adams County, Illinois, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1994, making it 31 years old at the 2025 inventory.
It carries about 5,800 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 169 of the 317 inventoried bridges in Adams County rated fair (53.3%); 19 (6.0%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 229 ft
Location	2MI N I172/24 Int
NBI structure number	001008300000000
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Fai 172 over Fall Creek	1982	13,100	Good
Ill 104 over Fai 172	1976	12,000	Fair
Fau 7810 (il 96) over Emery Creek	2016	11,300	Good
Ill 96 over Curtis Creek	2003	10,500	Fair
Fai 172 over Austin Creek	1982	9,750	Fair
US 24(WB)/ Broadwa over Miss. R/streets/bnrr	1986	8,600	Fair