US Bridges

US 136 over Allens Grove Ditch

Fair

Mason County, Illinois · 2 MI W JCT Ill 29 · Structure no. 063200200000000

Built
1962
63 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete
Length
31 ft
2 main spans
Daily traffic
1,150
2023 count
Owner
State
State Highway Agency

About this bridge

US 136 over Allens Grove Ditch is a concrete culvert carrying US 136 over Allens Grove Ditch in Mason County, Illinois. It was built in 1962, so it is 63 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 1,150 vehicles a day, roughly 22% of them trucks, projected to reach 1,869 by 2046. The structure is 31 ft (9.5 m) long. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesUS 136
CrossesAllens Grove Ditch
Location2 MI W JCT Ill 29
RouteU.S. Route 136
CountyMason County
StateIllinois
Coordinates40.30446, -89.73505
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 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
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.3 US tons
Inventory rating38.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length31 ft (9.5 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,150 (2023)
Projected traffic1,869 by 2046
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 km)
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 US 136 over Allens Grove Ditch built?

It was built in 1962, making it 63 years old in 2025.

What condition is US 136 over Allens Grove Ditch 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 US 136 over Allens Grove Ditch carry?

About 1,150 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is US 136 over Allens Grove Ditch?

The structure is 31 ft (9.5 m) long with a longest span of 14 ft (4.3 m).

Who owns US 136 over Allens Grove Ditch?

It is owned by the State Highway Agency.