US Bridges

Algonquin RD over Desplaines Riv

Fair

Cook County, Illinois · Desplains Riv P11 · Structure no. 016684500000000

Built
1927
98 years old, rebuilt 1982
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
168 ft
3 main spans
Daily traffic
5,650
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Algonquin RD over Desplaines Riv is a prestressed concrete stringer/multi-beam or girder carrying Algonquin RD over Desplaines Riv in Cook County, Illinois. It was built in 1927 and reconstructed in 1982, so it is 98 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 5,650 vehicles a day, roughly 2% of them trucks, projected to reach 6,565 by 2046. The structure is 168 ft (51.2 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesAlgonquin RD
CrossesDesplaines Riv
LocationDesplains Riv P11
CountyCook County
StateIllinois
Coordinates42.0317, -87.87761
Functional classUrban Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.1 US tons
Inventory rating40.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length168 ft (51.2 m)
Longest span56 ft (17.1 m)
Deck width59 ft (18 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,650 (2022)
Projected traffic6,565 by 2046
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.6 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Algonquin RD over Desplaines Riv built?

It was built in 1927, making it 98 years old in 2025. It was reconstructed in 1982.

What condition is Algonquin RD over Desplaines Riv 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 July 2024.

How much traffic does Algonquin RD over Desplaines Riv carry?

About 5,650 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Algonquin RD over Desplaines Riv?

The structure is 168 ft (51.2 m) long with a longest span of 56 ft (17.1 m) and a deck 59 ft wide.

Who owns Algonquin RD over Desplaines Riv?

It is owned by the City or Municipal Highway Agency.