US Bridges

Comly Road over Grove Creek

Fair

Winnebago County, Illinois · 2 MI S of Pecatonica · Structure no. 101513500000000

Built
1987
38 years old
Condition
Fair
inspected May 2024
Type
Culvert
Concrete
Length
40 ft
3 main spans
Daily traffic
150
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Comly Road over Grove Creek is a concrete culvert carrying Comly Road over Grove Creek in Winnebago County, Illinois. It was built in 1987, so it is 38 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 15% of them trucks, projected to reach 202 by 2046. The structure is 40 ft (12.2 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesComly Road
CrossesGrove Creek
Location2 MI S of Pecatonica
RouteCounty Highway 0
CountyWinnebago County
StateIllinois
Coordinates42.27633, -89.35591
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.6 US tons
Inventory rating50 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span13 ft (4 m)
Deck width33 ft (10.1 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2022)
Projected traffic202 by 2046
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Comly Road over Grove Creek built?

It was built in 1987, making it 38 years old in 2025.

What condition is Comly Road over Grove 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 May 2024.

How much traffic does Comly Road over Grove Creek carry?

About 150 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is Comly Road over Grove Creek?

The structure is 40 ft (12.2 m) long with a longest span of 13 ft (4 m) and a deck 33 ft wide.

Who owns Comly Road over Grove Creek?

It is owned by the Town or Township Highway Agency.