US Bridges

Ill 15 over Beaucoup Creek

Fair

Washington County, Illinois · 3.8 MI W JCT U S 51 · Structure no. 095001300000000

Built
1921
104 years old, rebuilt 1971
Condition
Fair
inspected March 2024
Type
Channel Beam
Concrete
Length
28 ft
1 main span
Daily traffic
2,050
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 15 over Beaucoup Creek is a concrete channel beam carrying Ill 15 over Beaucoup Creek in Washington County, Illinois. It was built in 1921 and reconstructed in 1971, so it is 104 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 2,050 vehicles a day, roughly 10% of them trucks, projected to reach 2,178 by 2046. The structure is 28 ft (8.5 m) long and 34 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

Open in Google Maps
CarriesIll 15
CrossesBeaucoup Creek
Location3.8 MI W JCT U S 51
RouteState Highway 15
CountyWashington County
StateIllinois
Coordinates38.34672, -89.29356
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.1 US tons
Inventory rating45.7 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span27 ft (8.2 m)
Deck width34 ft (10.3 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,050 (2023)
Projected traffic2,178 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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 15 over Beaucoup Creek built?

It was built in 1921, making it 104 years old in 2025. It was reconstructed in 1971.

What condition is Ill 15 over Beaucoup 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 March 2024.

How much traffic does Ill 15 over Beaucoup Creek carry?

About 2,050 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Ill 15 over Beaucoup Creek?

The structure is 28 ft (8.5 m) long with a longest span of 27 ft (8.2 m) and a deck 34 ft wide.

Who owns Ill 15 over Beaucoup Creek?

It is owned by the State Highway Agency.