US Bridges

County Line Road over Br of Coon Creek

Fair

DeKalb County, Illinois · 3550N 1900E · Structure no. 019420800000000

Built
1980
45 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
53 ft
1 main span
Daily traffic
500
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

County Line Road over Br of Coon Creek is a prestressed concrete box beam or girders - multiple carrying County Line Road over Br of Coon Creek in DeKalb 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 500 vehicles a day, roughly 10% of them trucks, projected to reach 140 by 2046. The structure is 53 ft (16.1 m) long and 28 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCounty Line Road
CrossesBr of Coon Creek
Location3550N 1900E
RouteCounty Highway 0
CountyDeKalb County
StateIllinois
Coordinates42.14639, -88.58856
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length53 ft (16.1 m)
Longest span50 ft (15.3 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2023)
Projected traffic140 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 County Line Road over Br of Coon Creek built?

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

What condition is County Line Road over Br of Coon Creek 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 April 2024.

How much traffic does County Line Road over Br of Coon Creek carry?

About 500 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County Line Road over Br of Coon Creek?

The structure is 53 ft (16.1 m) long with a longest span of 50 ft (15.3 m) and a deck 28 ft wide.

Who owns County Line Road over Br of Coon Creek?

It is owned by the Town or Township Highway Agency.