US Bridges

Il 84 over Johnson Creek

Fair

Whiteside County, Illinois · 2.5 M N Ill 136 · Structure no. 098009500000000

Built
1980
45 years old, rebuilt 2024
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
233 ft
3 main spans
Daily traffic
5,500
2023 count
Owner
State
State Highway Agency

About this bridge

Il 84 over Johnson Creek is a steel continuous stringer/multi-beam or girder carrying Il 84 over Johnson Creek in Whiteside County, Illinois. It was built in 1980 and reconstructed in 2024, so it is 45 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 5,500 vehicles a day, roughly 13% of them trucks, projected to reach 5,858 by 2046. The structure is 233 ft (71.1 m) long and 43 ft wide. If it were closed, the detour would be 37.3 mi (60 km).

Location

Open in Google Maps
CarriesIl 84
CrossesJohnson Creek
Location2.5 M N Ill 136
RouteState Highway 84
CountyWhiteside County
StateIllinois
Coordinates41.89989, -90.12102
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
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 rating81 US tons
Inventory rating40.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length233 ft (71.1 m)
Longest span87 ft (26.5 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,500 (2023)
Projected traffic5,858 by 2046
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed37.3 mi (60 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 84 over Johnson Creek built?

It was built in 1980, making it 45 years old in 2025. It was reconstructed in 2024.

What condition is Il 84 over Johnson 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 May 2023.

How much traffic does Il 84 over Johnson Creek carry?

About 5,500 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is Il 84 over Johnson Creek?

The structure is 233 ft (71.1 m) long with a longest span of 87 ft (26.5 m) and a deck 43 ft wide.

Who owns Il 84 over Johnson Creek?

It is owned by the State Highway Agency.