US Bridges

Ill 97 over Big Creek

Poor

Fulton County, Illinois · 4 MI S of Cuba · Structure no. 029002700000000

Built
1928
97 years old, rebuilt 1978
Condition
Poor
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
99 ft
2 main spans
Daily traffic
1,450
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 97 over Big Creek is a steel continuous stringer/multi-beam or girder carrying Ill 97 over Big Creek in Fulton County, Illinois. It was built in 1928 and reconstructed in 1978, 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 1,450 vehicles a day, roughly 8% of them trucks, projected to reach 1,667 by 2046. The structure is 99 ft (30.2 m) long and 40 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

CarriesIll 97
CrossesBig Creek
Location4 MI S of Cuba
RouteState Highway 97
Coordinates40.4473, -90.17418
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, 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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating74.6 US tons
Inventory rating44.6 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length99 ft (30.2 m)
Longest span59 ft (18 m)
Deck width40 ft (12.3 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,450 (2023)
Projected traffic1,667 by 2046
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 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 97 over Big Creek built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1978.

What condition is Ill 97 over Big Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2023.

How much traffic does Ill 97 over Big Creek carry?

About 1,450 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Ill 97 over Big Creek?

The structure is 99 ft (30.2 m) long with a longest span of 59 ft (18 m) and a deck 40 ft wide.

Who owns Ill 97 over Big Creek?

It is owned by the State Highway Agency.