US Bridges

Main ST over Kishwaukee River

Fair

Boone County, Illinois · S of Lincoln Ave · Structure no. 004700200000000

Built
1972
53 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
233 ft
3 main spans
Daily traffic
4,150
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

Main ST over Kishwaukee River is a steel continuous stringer/multi-beam or girder carrying Main ST over Kishwaukee River in Boone County, Illinois. It was built in 1972, so it is 53 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 4,150 vehicles a day, roughly 3% of them trucks, projected to reach 4,316 by 2046. The structure is 233 ft (71 m) long and 68 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesMain ST
CrossesKishwaukee River
LocationS of Lincoln Ave
CountyBoone County
StateIllinois
Coordinates42.26073, -88.84151
Functional classUrban 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.2 US tons
Inventory rating43.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length233 ft (71 m)
Longest span88 ft (26.8 m)
Deck width68 ft (20.7 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,150 (2018)
Projected traffic4,316 by 2046
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Main ST over Kishwaukee River built?

It was built in 1972, making it 53 years old in 2025.

What condition is Main ST over Kishwaukee 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 September 2023.

How much traffic does Main ST over Kishwaukee River carry?

About 4,150 vehicles per day (2018 count), of which roughly 3% are trucks.

How long is Main ST over Kishwaukee River?

The structure is 233 ft (71 m) long with a longest span of 88 ft (26.8 m) and a deck 68 ft wide.

Who owns Main ST over Kishwaukee River?

It is owned by the City or Municipal Highway Agency.