US Bridges

Grange RD over Big Slough Ditch

Good

Henry County, Illinois · 1.2 Mi. S. of Il 92 · Structure no. 037015100000000

Built
1999
26 years old
Condition
Good
inspected August 2021
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
112 ft
3 main spans
Daily traffic
275
2020 count
Owner
State
State Highway Agency

About this bridge

Grange RD over Big Slough Ditch is a steel continuous stringer/multi-beam or girder carrying Grange RD over Big Slough Ditch in Henry County, Illinois. It was built in 1999, so it is 26 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 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 275 vehicles a day, roughly 9% of them trucks, projected to reach 297 by 2046. The structure is 112 ft (34 m) long and 31 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesGrange RD
CrossesBig Slough Ditch
Location1.2 Mi. S. of Il 92
RouteCounty Highway 0
CountyHenry County
StateIllinois
Coordinates41.53719, -90.04997
Functional classRural Minor Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2021
Inspection intervalevery 48 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95.7 US tons
Inventory rating57.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length112 ft (34 m)
Longest span41 ft (12.4 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic275 (2020)
Projected traffic297 by 2046
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Grange RD over Big Slough Ditch built?

It was built in 1999, making it 26 years old in 2025.

What condition is Grange RD over Big Slough Ditch 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 August 2021.

How much traffic does Grange RD over Big Slough Ditch carry?

About 275 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is Grange RD over Big Slough Ditch?

The structure is 112 ft (34 m) long with a longest span of 41 ft (12.4 m) and a deck 31 ft wide.

Who owns Grange RD over Big Slough Ditch?

It is owned by the State Highway Agency.