US Bridges

Il 251 over Kishwaukee River

Fair

Winnebago County, Illinois · At New Millford · Structure no. 101016300000000

Built
1996
29 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
300 ft
4 main spans
Daily traffic
3,300
2023 count
Owner
State
State Highway Agency

About this bridge

Il 251 over Kishwaukee River is a prestressed concrete continuous stringer/multi-beam or girder carrying Il 251 over Kishwaukee River in Winnebago County, Illinois. It was built in 1996, so it is 29 years old, younger 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 6 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 3,300 vehicles a day, roughly 9% of them trucks, projected to reach 3,308 by 2046. The structure is 300 ft (91.4 m) long and 83 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesIl 251
CrossesKishwaukee River
LocationAt New Millford
RouteState Highway 251
CountyWinnebago County
StateIllinois
Coordinates42.18413, -89.07205
Functional classUrban Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
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 geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.8 US tons
Inventory rating46.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length300 ft (91.4 m)
Longest span81 ft (24.8 m)
Deck width83 ft (25.3 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,300 (2023)
Projected traffic3,308 by 2046
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 251 over Kishwaukee River built?

It was built in 1996, making it 29 years old in 2025.

What condition is Il 251 over Kishwaukee River 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 May 2024.

How much traffic does Il 251 over Kishwaukee River carry?

About 3,300 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Il 251 over Kishwaukee River?

The structure is 300 ft (91.4 m) long with a longest span of 81 ft (24.8 m) and a deck 83 ft wide.

Who owns Il 251 over Kishwaukee River?

It is owned by the State Highway Agency.