US Bridges

Ill 15 over Elkhorn Creek

Fair

Washington County, Illinois · 0.6 MI E JCT Ill 153 · Structure no. 095002800000000

Built
1933
92 years old, rebuilt 2006
Condition
Fair
inspected March 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
189 ft
4 main spans
Daily traffic
2,050
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 15 over Elkhorn Creek is a prestressed concrete box beam or girders - multiple carrying Ill 15 over Elkhorn Creek in Washington County, Illinois. It was built in 1933 and reconstructed in 2006, so it is 92 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 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 2,050 vehicles a day, roughly 17% of them trucks, projected to reach 2,178 by 2046. The structure is 189 ft (57.6 m) long and 33 ft wide. If it were closed, the detour would be 42.3 mi (68 km).

CarriesIll 15
CrossesElkhorn Creek
Location0.6 MI E JCT Ill 153
RouteState Highway 15
Coordinates38.36464, -89.59908
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.2 US tons
Inventory rating48.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans4
Design loadHS 20
Structure length189 ft (57.6 m)
Longest span51 ft (15.4 m)
Deck width33 ft (10.2 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,050 (2023)
Projected traffic2,178 by 2046
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.3 mi (68 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$967,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Ill 15 over Elkhorn Creek built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 2006.

What condition is Ill 15 over Elkhorn 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 Elkhorn Creek carry?

About 2,050 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is Ill 15 over Elkhorn Creek?

The structure is 189 ft (57.6 m) long with a longest span of 51 ft (15.4 m) and a deck 33 ft wide.

Who owns Ill 15 over Elkhorn Creek?

It is owned by the State Highway Agency.