US Bridges

Marengo RD over Piscasaw Creek

Fair

Boone County, Illinois · 1.5 MI NE Belvidere · Structure no. 004304100000000

Built
1965
60 years old
Condition
Fair
inspected February 2024
Type
Slab
Concrete Continuous
Length
136 ft
4 main spans
Daily traffic
2,200
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Marengo RD over Piscasaw Creek is a concrete continuous slab carrying Marengo RD over Piscasaw Creek in Boone County, Illinois. It was built in 1965, so it is 60 years old, older 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 5 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 2,200 vehicles a day, roughly 18% of them trucks, projected to reach 2,288 by 2046. The structure is 136 ft (41.5 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesMarengo RD
CrossesPiscasaw Creek
Location1.5 MI NE Belvidere
RouteCounty Highway 0
CountyBoone County
StateIllinois
Coordinates42.2769, -88.80984
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating44 US tons
Inventory rating26.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length136 ft (41.5 m)
Longest span37 ft (11.3 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,200 (2023)
Projected traffic2,288 by 2046
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Marengo RD over Piscasaw Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is Marengo RD over Piscasaw 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 February 2024.

How much traffic does Marengo RD over Piscasaw Creek carry?

About 2,200 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is Marengo RD over Piscasaw Creek?

The structure is 136 ft (41.5 m) long with a longest span of 37 ft (11.3 m) and a deck 30 ft wide.

Who owns Marengo RD over Piscasaw Creek?

It is owned by the Town or Township Highway Agency.