US Bridges

Il 40 over Otter Creek

Fair

Carroll County, Illinois · 1.3 MI W Milledgvill · Structure no. 008005100000000

Built
2015
10 years old
Condition
Fair
inspected October 2021
Type
Stringer/Multi-beam or Girder
Steel
Length
91 ft
1 main span
Daily traffic
1,850
2023 count
Owner
State
State Highway Agency

About this bridge

Il 40 over Otter Creek is a steel stringer/multi-beam or girder carrying Il 40 over Otter Creek in Carroll County, Illinois. It was built in 2015, so it is 10 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 1,850 vehicles a day, roughly 22% of them trucks, projected to reach 1,566 by 2046. The structure is 91 ft (27.6 m) long and 35 ft wide. If it were closed, the detour would be 34.2 mi (55 km).

Location

Open in Google Maps
CarriesIl 40
CrossesOtter Creek
Location1.3 MI W Milledgvill
RouteState Highway 40
CountyCarroll County
StateIllinois
Coordinates41.97425, -89.8099
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2021
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.9 US tons
Inventory rating53.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length91 ft (27.6 m)
Longest span88 ft (26.8 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,850 (2023)
Projected traffic1,566 by 2046
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.2 mi (55 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 40 over Otter Creek built?

It was built in 2015, making it 10 years old in 2025.

What condition is Il 40 over Otter 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 October 2021.

How much traffic does Il 40 over Otter Creek carry?

About 1,850 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is Il 40 over Otter Creek?

The structure is 91 ft (27.6 m) long with a longest span of 88 ft (26.8 m) and a deck 35 ft wide.

Who owns Il 40 over Otter Creek?

It is owned by the State Highway Agency.