US Bridges

Ill 100 over Otter CR

Fair

Fulton County, Illinois · S Edge of Enion · Structure no. 029002200000000

Built
1934
91 years old, rebuilt 1988
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
233 ft
1 main span
Daily traffic
550
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 100 over Otter CR is a steel stringer/multi-beam or girder carrying Ill 100 over Otter CR in Fulton County, Illinois. It was built in 1934 and reconstructed in 1988, so it is 91 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 550 vehicles a day, roughly 20% of them trucks, projected to reach 682 by 2046. The structure is 233 ft (71.1 m) long and 32 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesIll 100
CrossesOtter CR
LocationS Edge of Enion
RouteState Highway 100
CountyFulton County
StateIllinois
Coordinates40.27275, -90.1753
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating33.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+3 approach)
Design loadHS 20
Structure length233 ft (71.1 m)
Longest span103 ft (31.3 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic550 (2023)
Projected traffic682 by 2046
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 100 over Otter CR built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1988.

What condition is Ill 100 over Otter CR 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 November 2023.

How much traffic does Ill 100 over Otter CR carry?

About 550 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is Ill 100 over Otter CR?

The structure is 233 ft (71.1 m) long with a longest span of 103 ft (31.3 m) and a deck 32 ft wide.

Who owns Ill 100 over Otter CR?

It is owned by the State Highway Agency.