US Bridges

Harmon RD over Bass Ditch

Fair

Lee County, Illinois · 1.5 M N Bureau CO LN · Structure no. 052425700000000

Built
1980
45 years old
Condition
Fair
inspected February 2024
Type
Channel Beam
Concrete
Length
71 ft
3 main spans
Daily traffic
150
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Harmon RD over Bass Ditch is a concrete channel beam carrying Harmon RD over Bass Ditch in Lee County, Illinois. It was built in 1980, so it is 45 years old, younger 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 6 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 150 vehicles a day, roughly 35% of them trucks, projected to reach 126 by 2046. The structure is 71 ft (21.6 m) long and 26 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesHarmon RD
CrossesBass Ditch
Location1.5 M N Bureau CO LN
RouteCounty Highway 0
Coordinates41.6063, -89.55479
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum 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 rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length71 ft (21.6 m)
Longest span26 ft (7.9 m)
Deck width26 ft (8 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2022)
Projected traffic126 by 2046
Trucks35%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 Harmon RD over Bass Ditch built?

It was built in 1980, making it 45 years old in 2025.

What condition is Harmon RD over Bass 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 February 2024.

How much traffic does Harmon RD over Bass Ditch carry?

About 150 vehicles per day (2022 count), of which roughly 35% are trucks.

How long is Harmon RD over Bass Ditch?

The structure is 71 ft (21.6 m) long with a longest span of 26 ft (7.9 m) and a deck 26 ft wide.

Who owns Harmon RD over Bass Ditch?

It is owned by the Town or Township Highway Agency.