US Bridges

Co. Hwy. 15 over Lonetree Ditch

Poor

Henderson County, Illinois · NW-30-T10NR5W · Structure no. 036304800000000

Built
1979
46 years old
Condition
Poor
inspected February 2023
Type
Channel Beam
Concrete
Length
40 ft
1 main span
Daily traffic
575
2021 count
Owner
County
County Highway Agency

About this bridge

Co. Hwy. 15 over Lonetree Ditch is a concrete channel beam carrying Co. Hwy. 15 over Lonetree Ditch in Henderson County, Illinois. It was built in 1979, so it is 46 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 575 vehicles a day, roughly 7% of them trucks, projected to reach 581 by 2046. The structure is 40 ft (12.2 m) long and 31 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesCo. Hwy. 15
CrossesLonetree Ditch
LocationNW-30-T10NR5W
RouteCounty Highway 0
CountyHenderson County
StateIllinois
Coordinates40.83535, -91.01815
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.6 US tons
Inventory rating24.3 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span37 ft (11.3 m)
Deck width31 ft (9.3 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic575 (2021)
Projected traffic581 by 2046
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Co. Hwy. 15 over Lonetree Ditch built?

It was built in 1979, making it 46 years old in 2025.

What condition is Co. Hwy. 15 over Lonetree Ditch in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2023.

How much traffic does Co. Hwy. 15 over Lonetree Ditch carry?

About 575 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is Co. Hwy. 15 over Lonetree Ditch?

The structure is 40 ft (12.2 m) long with a longest span of 37 ft (11.3 m) and a deck 31 ft wide.

Who owns Co. Hwy. 15 over Lonetree Ditch?

It is owned by the County Highway Agency.