US Bridges

Main Street over S Rbr. Kishwaukee

Fair

McHenry County, Illinois · 0.1MI W Coyne Sta RD · Structure no. 056301800000000

Built
1961
64 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete Continuous
Length
63 ft
3 main spans
Daily traffic
9,500
2021 count
Owner
County
County Highway Agency

About this bridge

Main Street over S Rbr. Kishwaukee is a concrete continuous slab carrying Main Street over S Rbr. Kishwaukee in McHenry County, Illinois. It was built in 1961, so it is 64 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 9,500 vehicles a day, roughly 4% of them trucks, projected to reach 11,400 by 2046. The structure is 63 ft (19.2 m) long and 34 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesMain Street
CrossesS Rbr. Kishwaukee
Location0.1MI W Coyne Sta RD
CountyMcHenry County
StateIllinois
Coordinates42.16823, -88.45374
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.1 US tons
Inventory rating45.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length63 ft (19.2 m)
Longest span24 ft (7.3 m)
Deck width34 ft (10.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,500 (2021)
Projected traffic11,400 by 2046
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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$342,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Main Street over S Rbr. Kishwaukee built?

It was built in 1961, making it 64 years old in 2025.

What condition is Main Street over S Rbr. Kishwaukee 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 October 2024.

How much traffic does Main Street over S Rbr. Kishwaukee carry?

About 9,500 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is Main Street over S Rbr. Kishwaukee?

The structure is 63 ft (19.2 m) long with a longest span of 24 ft (7.3 m) and a deck 34 ft wide.

Who owns Main Street over S Rbr. Kishwaukee?

It is owned by the County Highway Agency.