US Bridges

Il 47 over Small Stream

Fair

McHenry County, Illinois · 7.8 M S State Line · Structure no. 056005400000000

Built
1985
40 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
73 ft
1 main span
Daily traffic
4,500
2023 count
Owner
State
State Highway Agency

About this bridge

Il 47 over Small Stream is a prestressed concrete stringer/multi-beam or girder carrying Il 47 over Small Stream in McHenry County, Illinois. It was built in 1985, so it is 40 years old, younger 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 4,500 vehicles a day, roughly 11% of them trucks, projected to reach 6,660 by 2046. The structure is 73 ft (22.3 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesIl 47
CrossesSmall Stream
Location7.8 M S State Line
RouteState Highway 47
CountyMcHenry County
StateIllinois
Coordinates42.38845, -88.44257
Functional classRural Principal Arterial - Other

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating77.8 US tons
Inventory rating37.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length73 ft (22.3 m)
Longest span64 ft (19.5 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,500 (2023)
Projected traffic6,660 by 2046
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 Il 47 over Small Stream built?

It was built in 1985, making it 40 years old in 2025.

What condition is Il 47 over Small Stream 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 Il 47 over Small Stream carry?

About 4,500 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is Il 47 over Small Stream?

The structure is 73 ft (22.3 m) long with a longest span of 64 ft (19.5 m) and a deck 43 ft wide.

Who owns Il 47 over Small Stream?

It is owned by the State Highway Agency.