US Bridges

TR-418 over Drowning Fork

FairPosted for load

McDonough County, Illinois · SE-21-T7NR1W · Structure no. 055410600000000

Built
1956
69 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
74 ft
3 main spans
Daily traffic
325
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR-418 over Drowning Fork is a concrete continuous slab carrying TR-418 over Drowning Fork in McDonough County, Illinois. It was built in 1956, so it is 69 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. Its operating status is: posted for load restriction.

It carries about 325 vehicles a day, roughly 2% of them trucks, projected to reach 328 by 2046. The structure is 74 ft (22.6 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesTR-418
CrossesDrowning Fork
LocationSE-21-T7NR1W
RouteCounty Highway 0
CountyMcDonough County
StateIllinois
Coordinates40.5768, -90.50397
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length74 ft (22.6 m)
Longest span29 ft (8.7 m)
Deck width26 ft (8 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic325 (2021)
Projected traffic328 by 2046
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$309,000
NavigationNo navigation control on waterway

Frequently asked questions

When was TR-418 over Drowning Fork built?

It was built in 1956, making it 69 years old in 2025.

What condition is TR-418 over Drowning Fork 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 2025.

How much traffic does TR-418 over Drowning Fork carry?

About 325 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is TR-418 over Drowning Fork?

The structure is 74 ft (22.6 m) long with a longest span of 29 ft (8.7 m) and a deck 26 ft wide.

Who owns TR-418 over Drowning Fork?

It is owned by the Town or Township Highway Agency.