US Bridges

Poplar Grove RD over Kishwaukee River

Good

Boone County, Illinois · NE Edge of Belvidere · Structure no. 004309800000000

Built
2020
5 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
289 ft
3 main spans
Daily traffic
2,200
2023 count
Owner
County
County Highway Agency

About this bridge

Poplar Grove RD over Kishwaukee River is a steel continuous stringer/multi-beam or girder carrying Poplar Grove RD over Kishwaukee River in Boone County, Illinois. It was built in 2020, so it is 5 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 2,200 vehicles a day, roughly 10% of them trucks, projected to reach 3,016 by 2046. The structure is 289 ft (88.2 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesPoplar Grove RD
CrossesKishwaukee River
LocationNE Edge of Belvidere
CountyBoone County
StateIllinois
Coordinates42.26341, -88.82771
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length289 ft (88.2 m)
Longest span10 ft (3 m)
Deck width40 ft (12.1 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,200 (2023)
Projected traffic3,016 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Poplar Grove RD over Kishwaukee River built?

It was built in 2020, making it 5 years old in 2025.

What condition is Poplar Grove RD over Kishwaukee River 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 April 2023.

How much traffic does Poplar Grove RD over Kishwaukee River carry?

About 2,200 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Poplar Grove RD over Kishwaukee River?

The structure is 289 ft (88.2 m) long with a longest span of 10 ft (3 m) and a deck 40 ft wide.

Who owns Poplar Grove RD over Kishwaukee River?

It is owned by the County Highway Agency.