US Bridges

Il 78 over Wolf Lake

Fair

Mason County, Illinois · 1.5 M N Chandlervill · Structure no. 063050000000000

Built
2010
15 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
330 ft
3 main spans
Daily traffic
1,450
2023 count
Owner
State
State Highway Agency

About this bridge

Il 78 over Wolf Lake is a steel continuous stringer/multi-beam or girder carrying Il 78 over Wolf Lake in Mason County, Illinois. It was built in 2010, so it is 15 years old, younger 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 6 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 1,450 vehicles a day, roughly 10% of them trucks, projected to reach 1,515 by 2046. The structure is 330 ft (100.7 m) long and 39 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesIl 78
CrossesWolf Lake
Location1.5 M N Chandlervill
RouteState Highway 78
CountyMason County
StateIllinois
Coordinates40.07853, -90.15324
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.2 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length330 ft (100.7 m)
Longest span132 ft (40.2 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,450 (2023)
Projected traffic1,515 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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 78 over Wolf Lake built?

It was built in 2010, making it 15 years old in 2025.

What condition is Il 78 over Wolf Lake 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 December 2024.

How much traffic does Il 78 over Wolf Lake carry?

About 1,450 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Il 78 over Wolf Lake?

The structure is 330 ft (100.7 m) long with a longest span of 132 ft (40.2 m) and a deck 39 ft wide.

Who owns Il 78 over Wolf Lake?

It is owned by the State Highway Agency.