US Bridges

Ill 78 over Coal Creek

Fair

Henry County, Illinois · 2 Miles N of Annawan · Structure no. 037013000000000

Built
1979
46 years old, rebuilt 2008
Condition
Fair
inspected February 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
83 ft
1 main span
Daily traffic
1,700
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 78 over Coal Creek is a prestressed concrete box beam or girders - multiple carrying Ill 78 over Coal Creek in Henry County, Illinois. It was built in 1979 and reconstructed in 2008, so it is 46 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 1,700 vehicles a day, roughly 26% of them trucks, projected to reach 1,566 by 2046. The structure is 83 ft (25.3 m) long and 33 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesIll 78
CrossesCoal Creek
Location2 Miles N of Annawan
RouteState Highway 78
CountyHenry County
StateIllinois
Coordinates41.43105, -89.90974
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: 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 rating70.8 US tons
Inventory rating42.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length83 ft (25.3 m)
Longest span78 ft (23.8 m)
Deck width33 ft (10.1 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,700 (2023)
Projected traffic1,566 by 2046
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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 Ill 78 over Coal Creek built?

It was built in 1979, making it 46 years old in 2025. It was reconstructed in 2008.

What condition is Ill 78 over Coal Creek 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 February 2023.

How much traffic does Ill 78 over Coal Creek carry?

About 1,700 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is Ill 78 over Coal Creek?

The structure is 83 ft (25.3 m) long with a longest span of 78 ft (23.8 m) and a deck 33 ft wide.

Who owns Ill 78 over Coal Creek?

It is owned by the State Highway Agency.