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Ill 149 over L. Mboro Spillway

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

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

Ill 149 over L. Mboro Spillway in Jackson County, Illinois, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 5 (fair condition) on the 0-9 scale.
It was built in 1933, making it 92 years old at the 2025 inventory.
It carries about 2,500 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 62 of the 228 inventoried bridges in Jackson County rated fair (27.2%); 16 (7.0%) 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

Component	Rating (2025)	FHWA scale meaning
Culvert	5	Fair condition


Structure	Continuous concrete culvert
Length	about 29 ft
Location	1.7 Mi W Murphysboro
NBI structure number	039200400000000
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Il 13 WB over Crab Orchard Creek	1995	25,800	Good
Ill 13 WB over Crab Orchard CR Ovfl	1995	25,800	Good
Il 13 EB over Crab Orchard Creek	2021	25,800	Good
Il 13 EB over Crab Orchard Creek	2021	25,800	Good
Ill Rte 13 over Trib-piles Fork Crk.	1948	25,500	Fair
Il Rte 13 over Little Crab Orchard	2007	21,600	Fair