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Fas 1595 (ch 19) over Sleepy Hallow Ditch

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

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

Fas 1595 (ch 19) over Sleepy Hallow Ditch in Mason 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 2012, making it 13 years old at the 2025 inventory.
It carries about 200 vehicles a day (traffic count year 2024).
Its listed owner is the county highway agency.
It is one of 31 of the 86 inventoried bridges in Mason County rated good (36.0%); 3 (3.5%) 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 120 ft
Location	4 M SW Mason City
NBI structure number	063303300000000
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
US 136 / Il 29 over Main Ditch	1958	2,500	Fair
Ill 29 over Allens Grove Ditch	1959	2,450	Good
Fap 614 (il 78) over Ditch	1978	2,250	Fair
Il 29 over Sleepy Hollow Ditch	1959	2,000	Fair
Il 29 over Salt Creek	2002	2,000	Fair
Ill 78 over White Oak Creek	1931	1,750	Fair