US Bridges

Denny RD over Geryline CR

Good

Boone County, Illinois · 3.5 MI SE Poplar Grove · Structure no. 004310200000000

Built
2021
4 years old
Condition
Good
inspected February 2024
Type
Culvert
Concrete
Length
37 ft
3 main spans
Daily traffic
300
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Denny RD over Geryline CR is a concrete culvert carrying Denny RD over Geryline CR in Boone County, Illinois. It was built in 2021, so it is 4 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 300 vehicles a day, roughly 24% of them trucks, projected to reach 182 by 2046. The structure is 37 ft (11.4 m) long and 37 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesDenny RD
CrossesGeryline CR
Location3.5 MI SE Poplar Grove
RouteCounty Highway 0
Coordinates42.32995, -88.76429
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection9 ExcellentNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.4 US tons
Inventory rating47.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 25 or greater
Structure length37 ft (11.4 m)
Longest span11 ft (3.3 m)
Deck width37 ft (11.3 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2023)
Projected traffic182 by 2046
Trucks24%
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

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 Denny RD over Geryline CR built?

It was built in 2021, making it 4 years old in 2025.

What condition is Denny RD over Geryline CR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2024.

How much traffic does Denny RD over Geryline CR carry?

About 300 vehicles per day (2023 count), of which roughly 24% are trucks.

How long is Denny RD over Geryline CR?

The structure is 37 ft (11.4 m) long with a longest span of 11 ft (3.3 m) and a deck 37 ft wide.

Who owns Denny RD over Geryline CR?

It is owned by the Town or Township Highway Agency.