US Bridges

Il 31 over Edgewood Ravine

Fair

McHenry County, Illinois · 0.5 M S of Il 62 · Structure no. 056001600000000

Built
1925
100 years old, rebuilt 1986
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
38 ft
1 main span
Daily traffic
21,200
2023 count
Owner
State
State Highway Agency

About this bridge

Il 31 over Edgewood Ravine is a steel stringer/multi-beam or girder carrying Il 31 over Edgewood Ravine in McHenry County, Illinois. It was built in 1925 and reconstructed in 1986, so it is 100 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 5 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 21,200 vehicles a day, roughly 6% of them trucks, projected to reach 24,960 by 2046. The structure is 38 ft (11.6 m) long and 48 ft wide.

Location

Open in Google Maps
CarriesIl 31
CrossesEdgewood Ravine
Location0.5 M S of Il 62
RouteState Highway 31
CountyMcHenry County
StateIllinois
Coordinates42.15801, -88.29716
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96.1 US tons
Inventory rating49.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span37 ft (11.2 m)
Deck width48 ft (14.6 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,200 (2023)
Projected traffic24,960 by 2046
Trucks6%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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$395,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Il 31 over Edgewood Ravine built?

It was built in 1925, making it 100 years old in 2025. It was reconstructed in 1986.

What condition is Il 31 over Edgewood Ravine 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 January 2024.

How much traffic does Il 31 over Edgewood Ravine carry?

About 21,200 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is Il 31 over Edgewood Ravine?

The structure is 38 ft (11.6 m) long with a longest span of 37 ft (11.2 m) and a deck 48 ft wide.

Who owns Il 31 over Edgewood Ravine?

It is owned by the State Highway Agency.