US Bridges

Ill 17 over Ill River

Fair

Marshall County, Illinois · 9.55 MI W of Ill 89 · Structure no. 062000300000000

Built
1939
86 years old, rebuilt 1990
Condition
Fair
inspected April 2024
Type
Truss - Thru
Steel Continuous
Length
1,573 ft
3 main spans
Daily traffic
7,000
2021 count
Owner
State
State Highway Agency

About this bridge

Ill 17 over Ill River is a steel continuous truss - thru carrying Ill 17 over Ill River in Marshall County, Illinois. It was built in 1939 and reconstructed in 1990, so it is 86 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 7,000 vehicles a day, roughly 12% of them trucks, projected to reach 7,070 by 2046. The structure is 1,573 ft (479.5 m) long and 29 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesIll 17
CrossesIll River
Location9.55 MI W of Ill 89
RouteState Highway 17
CountyMarshall County
StateIllinois
Coordinates41.02634, -89.42053
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.
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 protection7 GoodSome minor problems.
Last inspectionApril 2024
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating53.2 US tons
Inventory rating31.7 US tons

Structure

Structure typeTruss - Thru
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+8 approach)
Design loadHS 20
Structure length1,573 ft (479.5 m)
Longest span378 ft (115.2 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (8 m)
Vertical clearance over deck16 ft (5 m)

Traffic and service

Average daily traffic7,000 (2021)
Projected traffic7,070 by 2046
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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$13.4 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Ill 17 over Ill River built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1990.

What condition is Ill 17 over Ill River 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 April 2024.

How much traffic does Ill 17 over Ill River carry?

About 7,000 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is Ill 17 over Ill River?

The structure is 1,573 ft (479.5 m) long with a longest span of 378 ft (115.2 m) and a deck 29 ft wide.

Who owns Ill 17 over Ill River?

It is owned by the State Highway Agency.