US Bridges

Il 31 SB Ent Ramp over Crystal Creek

Good

McHenry County, Illinois · 0.1 M S Algonquin RD · Structure no. 056008000000000

Built
2013
12 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
150 ft
1 main span
Daily traffic
1,500
2023 count
Owner
State
State Highway Agency

About this bridge

Il 31 SB Ent Ramp over Crystal Creek is a steel stringer/multi-beam or girder carrying Il 31 SB Ent Ramp over Crystal Creek in McHenry County, Illinois. It was built in 2013, so it is 12 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,500 vehicles a day, roughly 5% of them trucks, projected to reach 1,692 by 2046. The structure is 150 ft (45.6 m) long and 33 ft wide.

Location

Open in Google Maps
CarriesIl 31 SB Ent Ramp
CrossesCrystal Creek
Location0.1 M S Algonquin RD
CountyMcHenry County
StateIllinois
Coordinates42.16881, -88.29723
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.1 US tons
Inventory rating55.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length150 ft (45.6 m)
Longest span142 ft (43.3 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,500 (2023)
Projected traffic1,692 by 2046
Trucks5%
Lanes on structure1
Traffic directionOne-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 31 SB Ent Ramp over Crystal Creek built?

It was built in 2013, making it 12 years old in 2025.

What condition is Il 31 SB Ent Ramp over Crystal Creek 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 September 2023.

How much traffic does Il 31 SB Ent Ramp over Crystal Creek carry?

About 1,500 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Il 31 SB Ent Ramp over Crystal Creek?

The structure is 150 ft (45.6 m) long with a longest span of 142 ft (43.3 m) and a deck 33 ft wide.

Who owns Il 31 SB Ent Ramp over Crystal Creek?

It is owned by the State Highway Agency.