US Bridges

Ill 40 over Green River

Fair

Whiteside County, Illinois · 1 MI S Deer Grove · Structure no. 098001800000000

Built
1928
97 years old, rebuilt 2006
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
186 ft
3 main spans
Daily traffic
2,550
2021 count
Owner
State
State Highway Agency

About this bridge

Ill 40 over Green River is a steel continuous stringer/multi-beam or girder carrying Ill 40 over Green River in Whiteside County, Illinois. It was built in 1928 and reconstructed in 2006, so it is 97 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 2,550 vehicles a day, roughly 26% of them trucks, projected to reach 2,576 by 2046. The structure is 186 ft (56.7 m) long and 39 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesIll 40
CrossesGreen River
Location1 MI S Deer Grove
RouteState Highway 40
CountyWhiteside County
StateIllinois
Coordinates41.59471, -89.68924
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 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 rating93.6 US tons
Inventory rating56.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length186 ft (56.7 m)
Longest span62 ft (18.8 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,550 (2021)
Projected traffic2,576 by 2046
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$774,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Ill 40 over Green River built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 2006.

What condition is Ill 40 over Green River 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 March 2023.

How much traffic does Ill 40 over Green River carry?

About 2,550 vehicles per day (2021 count), of which roughly 26% are trucks.

How long is Ill 40 over Green River?

The structure is 186 ft (56.7 m) long with a longest span of 62 ft (18.8 m) and a deck 39 ft wide.

Who owns Ill 40 over Green River?

It is owned by the State Highway Agency.