US Bridges

Ill 29 over Allens Grove Ditch

Good

Menard County, Illinois · 3 MI N Greenview · Structure no. 065200000000000

Built
1960
65 years old
Condition
Good
inspected March 2023
Type
Culvert
Concrete
Length
31 ft
3 main spans
Daily traffic
2,000
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 29 over Allens Grove Ditch is a concrete culvert carrying Ill 29 over Allens Grove Ditch in Menard County, Illinois. It was built in 1960, so it is 65 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 2,000 vehicles a day, roughly 18% of them trucks, projected to reach 2,000 by 2046. The structure is 31 ft (9.4 m) long. If it were closed, the detour would be 39.8 mi (64 km).

CarriesIll 29
CrossesAllens Grove Ditch
Location3 MI N Greenview
RouteState Highway 29
Coordinates40.12111, -89.73538
Functional classRural Minor Arterial

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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2023
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
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.8 US tons
Inventory rating22.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span10 ft (3.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2023)
Projected traffic2,000 by 2046
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.8 mi (64 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 Ill 29 over Allens Grove Ditch built?

It was built in 1960, making it 65 years old in 2025.

What condition is Ill 29 over Allens Grove 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 March 2023.

How much traffic does Ill 29 over Allens Grove Ditch carry?

About 2,000 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is Ill 29 over Allens Grove Ditch?

The structure is 31 ft (9.4 m) long with a longest span of 10 ft (3.2 m).

Who owns Ill 29 over Allens Grove Ditch?

It is owned by the State Highway Agency.