US Bridges

Ill 177 over Reinhardt Slough

Fair

St. Clair County, Illinois · 1.4M E of JCT Il 4 · Structure no. 082203400000000

Built
1994
31 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete
Length
28 ft
2 main spans
Daily traffic
2,450
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 177 over Reinhardt Slough is a concrete culvert carrying Ill 177 over Reinhardt Slough in St. Clair County, Illinois. It was built in 1994, so it is 31 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 2,450 vehicles a day, roughly 7% of them trucks, projected to reach 2,525 by 2046. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 24.2 mi (39 km).

Location

Open in Google Maps
CarriesIll 177
CrossesReinhardt Slough
Location1.4M E of JCT Il 4
RouteState Highway 177
CountySt. Clair County
StateIllinois
Coordinates38.48763, -89.76702
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating37.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span13 ft (4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,450 (2023)
Projected traffic2,525 by 2046
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 Ill 177 over Reinhardt Slough built?

It was built in 1994, making it 31 years old in 2025.

What condition is Ill 177 over Reinhardt Slough 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 Ill 177 over Reinhardt Slough carry?

About 2,450 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Ill 177 over Reinhardt Slough?

The structure is 28 ft (8.5 m) long with a longest span of 13 ft (4 m).

Who owns Ill 177 over Reinhardt Slough?

It is owned by the State Highway Agency.