US Bridges

Ill 149 over L. Mboro Spillway

Fair

Jackson County, Illinois · 1.7 MI W Murphysboro · Structure no. 039200400000000

Built
1933
92 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete Continuous
Length
30 ft
2 main spans
Daily traffic
2,500
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 149 over L. Mboro Spillway is a concrete continuous culvert carrying Ill 149 over L. Mboro Spillway in Jackson County, Illinois. It was built in 1933, so it is 92 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 2,500 vehicles a day, roughly 14% of them trucks, projected to reach 2,778 by 2046. The structure is 30 ft (9.1 m) long. If it were closed, the detour would be 32.9 mi (53 km).

Location

Open in Google Maps
CarriesIll 149
CrossesL. Mboro Spillway
Location1.7 MI W Murphysboro
RouteState Highway 149
CountyJackson County
StateIllinois
Coordinates37.77183, -89.38386
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating98.2 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span15 ft (4.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,500 (2023)
Projected traffic2,778 by 2046
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed32.9 mi (53 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ill 149 over L. Mboro Spillway built?

It was built in 1933, making it 92 years old in 2025.

What condition is Ill 149 over L. Mboro Spillway in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2025.

How much traffic does Ill 149 over L. Mboro Spillway carry?

About 2,500 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is Ill 149 over L. Mboro Spillway?

The structure is 30 ft (9.1 m) long with a longest span of 15 ft (4.6 m).

Who owns Ill 149 over L. Mboro Spillway?

It is owned by the State Highway Agency.