US Bridges

11th St. (IL251) over S.E. Drainage

Fair

Winnebago County, Illinois · .35 Mi. S Harrison · Structure no. 101200000000000

Built
1964
61 years old
Condition
Fair
inspected March 2023
Type
Culvert
Concrete
Length
34 ft
3 main spans
Daily traffic
16,100
2023 count
Owner
State
State Highway Agency

About this bridge

11th St. (IL251) over S.E. Drainage is a concrete culvert carrying 11th St. (IL251) over S.E. Drainage in Winnebago County, Illinois. It was built in 1964, so it is 61 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 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 16,100 vehicles a day, roughly 8% of them trucks, projected to reach 17,069 by 2046. The structure is 34 ft (10.4 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Carries11th St. (IL251)
CrossesS.E. Drainage
Location.35 Mi. S Harrison
RouteState Highway 251
Coordinates42.23324, -89.07225
Functional classUrban Other Principal 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.3 US tons
Inventory rating29.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length34 ft (10.4 m)
Longest span11 ft (3.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,100 (2023)
Projected traffic17,069 by 2046
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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 11th St. (IL251) over S.E. Drainage built?

It was built in 1964, making it 61 years old in 2025.

What condition is 11th St. (IL251) over S.E. Drainage 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 March 2023.

How much traffic does 11th St. (IL251) over S.E. Drainage carry?

About 16,100 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is 11th St. (IL251) over S.E. Drainage?

The structure is 34 ft (10.4 m) long with a longest span of 11 ft (3.3 m).

Who owns 11th St. (IL251) over S.E. Drainage?

It is owned by the State Highway Agency.