US Bridges

Garden Prairie RD over Coon Creek

Fair

Boone County, Illinois · 1.5 MI S Garden Pr · Structure no. 004309000000000

Built
2005
20 years old
Condition
Fair
inspected March 2024
Type
Slab
Concrete
Length
157 ft
5 main spans
Daily traffic
475
2023 count
Owner
County
County Highway Agency

About this bridge

Garden Prairie RD over Coon Creek is a concrete slab carrying Garden Prairie RD over Coon Creek in Boone County, Illinois. It was built in 2005, so it is 20 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 475 vehicles a day, roughly 13% of them trucks, projected to reach 520 by 2046. The structure is 157 ft (48 m) long and 40 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesGarden Prairie RD
CrossesCoon Creek
Location1.5 MI S Garden Pr
RouteCounty Highway 0
CountyBoone County
StateIllinois
Coordinates42.23388, -88.72515
Functional classRural Minor Collector

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 protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating94.2 US tons
Inventory rating56.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length157 ft (48 m)
Longest span34 ft (10.4 m)
Deck width40 ft (12.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic475 (2023)
Projected traffic520 by 2046
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Garden Prairie RD over Coon Creek built?

It was built in 2005, making it 20 years old in 2025.

What condition is Garden Prairie RD over 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 March 2024.

How much traffic does Garden Prairie RD over Coon Creek carry?

About 475 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is Garden Prairie RD over Coon Creek?

The structure is 157 ft (48 m) long with a longest span of 34 ft (10.4 m) and a deck 40 ft wide.

Who owns Garden Prairie RD over Coon Creek?

It is owned by the County Highway Agency.