US Bridges

US Rt 30 over Elkhorn Creek

Fair

Whiteside County, Illinois · 3.5 MI W Rock Falls · Structure no. 098003200000000

Built
1940
85 years old, rebuilt 1984
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
120 ft
3 main spans
Daily traffic
5,300
2023 count
Owner
State
State Highway Agency

About this bridge

US Rt 30 over Elkhorn Creek is a steel continuous stringer/multi-beam or girder carrying US Rt 30 over Elkhorn Creek in Whiteside County, Illinois. It was built in 1940 and reconstructed in 1984, so it is 85 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 5,300 vehicles a day, roughly 11% of them trucks, projected to reach 4,798 by 2046. The structure is 120 ft (36.6 m) long and 43 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUS Rt 30
CrossesElkhorn Creek
Location3.5 MI W Rock Falls
RouteU.S. Route 30
CountyWhiteside County
StateIllinois
Coordinates41.77224, -89.77414
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum 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 rating70.3 US tons
Inventory rating42.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length120 ft (36.6 m)
Longest span46 ft (13.9 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,300 (2023)
Projected traffic4,798 by 2046
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 US Rt 30 over Elkhorn Creek built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1984.

What condition is US Rt 30 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 December 2023.

How much traffic does US Rt 30 over Elkhorn Creek carry?

About 5,300 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is US Rt 30 over Elkhorn Creek?

The structure is 120 ft (36.6 m) long with a longest span of 46 ft (13.9 m) and a deck 43 ft wide.

Who owns US Rt 30 over Elkhorn Creek?

It is owned by the State Highway Agency.