US Bridges

TR 351 over Cahokia CR

Fair

Macoupin County, Illinois · 4.5 NE Eagerville · Structure no. 059501700000000

Built
1920
105 years old, rebuilt 1970
Condition
Fair
inspected January 2023
Type
Culvert
Steel
Length
23 ft
2 main spans
Daily traffic
175
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 351 over Cahokia CR is a steel culvert carrying TR 351 over Cahokia CR in Macoupin County, Illinois. It was built in 1920 and reconstructed in 1970, so it is 105 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 5 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 175 vehicles a day, roughly 8% of them trucks, projected to reach 177 by 2046. The structure is 23 ft (7 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesTR 351
CrossesCahokia CR
Location4.5 NE Eagerville
RouteCounty Highway 0
CountyMacoupin County
StateIllinois
Coordinates39.16815, -89.72568
Functional classRural Local

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.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating98.2 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length23 ft (7 m)
Longest span10 ft (3.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic175 (2021)
Projected traffic177 by 2046
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 TR 351 over Cahokia CR built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1970.

What condition is TR 351 over Cahokia CR 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 January 2023.

How much traffic does TR 351 over Cahokia CR carry?

About 175 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is TR 351 over Cahokia CR?

The structure is 23 ft (7 m) long with a longest span of 10 ft (3.2 m).

Who owns TR 351 over Cahokia CR?

It is owned by the Town or Township Highway Agency.