US Bridges

Il 99 over Missouri CR Overflow

Fair

Schuyler County, Illinois · .47M N Brown County · Structure no. 085201500000000

Built
1986
39 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete Continuous
Length
23 ft
2 main spans
Daily traffic
500
2023 count
Owner
State
State Highway Agency

About this bridge

Il 99 over Missouri CR Overflow is a concrete continuous culvert carrying Il 99 over Missouri CR Overflow in Schuyler County, Illinois. It was built in 1986, so it is 39 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 500 vehicles a day, roughly 10% of them trucks, projected to reach 455 by 2046. The structure is 23 ft (6.9 m) long. If it were closed, the detour would be 14.9 mi (24 km).

CarriesIl 99
CrossesMissouri CR Overflow
Location.47M N Brown County
RouteState Highway 99
Coordinates40.11185, -90.76719
Functional classRural Major 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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.5 US tons
Inventory rating43.5 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length23 ft (6.9 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2023)
Projected traffic455 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Il 99 over Missouri CR Overflow built?

It was built in 1986, making it 39 years old in 2025.

What condition is Il 99 over Missouri CR Overflow 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 July 2024.

How much traffic does Il 99 over Missouri CR Overflow carry?

About 500 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Il 99 over Missouri CR Overflow?

The structure is 23 ft (6.9 m) long with a longest span of 10 ft (3 m).

Who owns Il 99 over Missouri CR Overflow?

It is owned by the State Highway Agency.