US Bridges

Denny Road over Piscasaw Creek

Poor

Boone County, Illinois · 2.5 SE Poplar Grove · Structure no. 004306800000000

Built
1977
48 years old
Condition
Poor
inspected October 2024
Type
Channel Beam
Concrete
Length
122 ft
4 main spans
Daily traffic
50
2018 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Denny Road over Piscasaw Creek is a concrete channel beam carrying Denny Road over Piscasaw Creek in Boone County, Illinois. It was built in 1977, so it is 48 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 50 vehicles a day, projected to reach 52 by 2046. The structure is 122 ft (37.1 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesDenny Road
CrossesPiscasaw Creek
Location2.5 SE Poplar Grove
RouteCounty Highway 0
CountyBoone County
StateIllinois
Coordinates42.34688, -88.7644
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50.7 US tons
Inventory rating30.3 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans4
Design loadHS 20
Structure length122 ft (37.1 m)
Longest span30 ft (9.1 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2018)
Projected traffic52 by 2046
Trucks0%
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 Road over Piscasaw Creek built?

It was built in 1977, making it 48 years old in 2025.

What condition is Denny Road over Piscasaw Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does Denny Road over Piscasaw Creek carry?

About 50 vehicles per day (2018 count).

How long is Denny Road over Piscasaw Creek?

The structure is 122 ft (37.1 m) long with a longest span of 30 ft (9.1 m) and a deck 26 ft wide.

Who owns Denny Road over Piscasaw Creek?

It is owned by the Town or Township Highway Agency.