US Bridges

I-55 over Brewster Run

Good

Grundy County, Illinois · .5 MI W of Ill 47 · Structure no. 032200300000000

Built
1979
46 years old
Condition
Good
inspected February 2023
Type
Culvert
Concrete Continuous
Length
27 ft
2 main spans
Daily traffic
22,900
2023 count
Owner
State
State Highway Agency

About this bridge

I-55 over Brewster Run is a concrete continuous culvert carrying I-55 over Brewster Run in Grundy County, Illinois. It was built in 1979, so it is 46 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 22,900 vehicles a day, roughly 31% of them trucks, projected to reach 23,760 by 2046. The structure is 27 ft (8.2 m) long and 88 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI-55
CrossesBrewster Run
Location.5 MI W of Ill 47
RouteInterstate 55
CountyGrundy County
StateIllinois
Coordinates41.1158, -88.42174
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating107.1 US tons
Inventory rating102.2 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length27 ft (8.2 m)
Longest span12 ft (3.8 m)
Deck width88 ft (26.8 m)
Roadway width88 ft (26.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,900 (2023)
Projected traffic23,760 by 2046
Trucks31%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-55 over Brewster Run built?

It was built in 1979, making it 46 years old in 2025.

What condition is I-55 over Brewster Run in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2023.

How much traffic does I-55 over Brewster Run carry?

About 22,900 vehicles per day (2023 count), of which roughly 31% are trucks.

How long is I-55 over Brewster Run?

The structure is 27 ft (8.2 m) long with a longest span of 12 ft (3.8 m) and a deck 88 ft wide.

Who owns I-55 over Brewster Run?

It is owned by the State Highway Agency.