US Bridges

Il 40 FAP 646 over Hennepin Canal

Poor

Bureau County, Illinois · 0.4 MI S JCT FAI 80 · Structure no. 006009000000000

Built
1933
92 years old, rebuilt 1987
Condition
Poor
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
174 ft
5 main spans
Daily traffic
2,400
2023 count
Owner
State
State Highway Agency

About this bridge

Il 40 FAP 646 over Hennepin Canal is a steel continuous stringer/multi-beam or girder carrying Il 40 FAP 646 over Hennepin Canal in Bureau County, Illinois. It was built in 1933 and reconstructed in 1987, so it is 92 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 4 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 2,400 vehicles a day, roughly 16% of them trucks, projected to reach 3,081 by 2046. The structure is 174 ft (53 m) long and 35 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesIl 40 FAP 646
CrossesHennepin Canal
Location0.4 MI S JCT FAI 80
RouteState Highway 40
CountyBureau County
StateIllinois
Coordinates41.38343, -89.68652
Functional classRural Minor Arterial

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation7: Better than present minimum 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 rating92.8 US tons
Inventory rating55.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length174 ft (53 m)
Longest span43 ft (13.1 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,400 (2023)
Projected traffic3,081 by 2046
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Il 40 FAP 646 over Hennepin Canal built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1987.

What condition is Il 40 FAP 646 over Hennepin Canal 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 February 2023.

How much traffic does Il 40 FAP 646 over Hennepin Canal carry?

About 2,400 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is Il 40 FAP 646 over Hennepin Canal?

The structure is 174 ft (53 m) long with a longest span of 43 ft (13.1 m) and a deck 35 ft wide.

Who owns Il 40 FAP 646 over Hennepin Canal?

It is owned by the State Highway Agency.