US Bridges

Il 150 over Little Marys River

Good

Randolph County, Illinois · 1.8MI N. of Chester · Structure no. 079004500000000

Built
1999
26 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
217 ft
3 main spans
Daily traffic
5,450
2023 count
Owner
State
State Highway Agency

About this bridge

Il 150 over Little Marys River is a prestressed concrete stringer/multi-beam or girder carrying Il 150 over Little Marys River in Randolph County, Illinois. It was built in 1999, so it is 26 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,450 vehicles a day, roughly 29% of them trucks, projected to reach 5,606 by 2046. The structure is 217 ft (66.1 m) long and 43 ft wide. If it were closed, the detour would be 60.3 mi (97 km).

CarriesIl 150
CrossesLittle Marys River
Location1.8MI N. of Chester
RouteState Highway 150
Coordinates37.94899, -89.76686
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.3 US tons
Inventory rating51 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length217 ft (66.1 m)
Longest span85 ft (25.8 m)
Deck width43 ft (13 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,450 (2023)
Projected traffic5,606 by 2046
Trucks29%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed60.3 mi (97 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 Il 150 over Little Marys River built?

It was built in 1999, making it 26 years old in 2025.

What condition is Il 150 over Little Marys River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does Il 150 over Little Marys River carry?

About 5,450 vehicles per day (2023 count), of which roughly 29% are trucks.

How long is Il 150 over Little Marys River?

The structure is 217 ft (66.1 m) long with a longest span of 85 ft (25.8 m) and a deck 43 ft wide.

Who owns Il 150 over Little Marys River?

It is owned by the State Highway Agency.