US Bridges

Il 47 over Blackberry Ck.

Fair

Kendall County, Illinois · 1 M N of US 34 · Structure no. 047005300000000

Built
1994
31 years old
Condition
Fair
inspected February 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
138 ft
3 main spans
Daily traffic
15,300
2023 count
Owner
State
State Highway Agency

About this bridge

Il 47 over Blackberry Ck. is a prestressed concrete stringer/multi-beam or girder carrying Il 47 over Blackberry Ck. in Kendall County, Illinois. It was built in 1994, so it is 31 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 15,300 vehicles a day, roughly 10% of them trucks, projected to reach 19,817 by 2046. The structure is 138 ft (42 m) long and 47 ft wide.

Location

Open in Google Maps
CarriesIl 47
CrossesBlackberry Ck.
Location1 M N of US 34
RouteState Highway 47
CountyKendall County
StateIllinois
Coordinates41.6719, -88.44287
Functional classUrban Other Principal 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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating65.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length138 ft (42 m)
Longest span62 ft (18.9 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,300 (2023)
Projected traffic19,817 by 2046
Trucks10%
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 Blackberry Ck. built?

It was built in 1994, making it 31 years old in 2025.

What condition is Il 47 over Blackberry Ck. 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 February 2022.

How much traffic does Il 47 over Blackberry Ck. carry?

About 15,300 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Il 47 over Blackberry Ck.?

The structure is 138 ft (42 m) long with a longest span of 62 ft (18.9 m) and a deck 47 ft wide.

Who owns Il 47 over Blackberry Ck.?

It is owned by the State Highway Agency.