US Bridges

TR 408 over Drowning Fork

Poor

McDonough County, Illinois · SW-28-T7NR1W · Structure no. 055410800000000

Built
1977
48 years old
Condition
Poor
inspected January 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
48 ft
1 main span
Daily traffic
225
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 408 over Drowning Fork is a prestressed concrete box beam or girders - multiple carrying TR 408 over Drowning Fork in McDonough County, Illinois. It was built in 1977, so it is 48 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 225 vehicles a day, roughly 9% of them trucks, projected to reach 227 by 2046. The structure is 48 ft (14.6 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesTR 408
CrossesDrowning Fork
LocationSW-28-T7NR1W
RouteCounty Highway 0
CountyMcDonough County
StateIllinois
Coordinates40.56258, -90.52327
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating76.1 US tons
Inventory rating45.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length48 ft (14.6 m)
Longest span46 ft (14 m)
Deck width27 ft (8.2 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic225 (2021)
Projected traffic227 by 2046
Trucks9%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was TR 408 over Drowning Fork built?

It was built in 1977, making it 48 years old in 2025.

What condition is TR 408 over Drowning Fork in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2025.

How much traffic does TR 408 over Drowning Fork carry?

About 225 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is TR 408 over Drowning Fork?

The structure is 48 ft (14.6 m) long with a longest span of 46 ft (14 m) and a deck 27 ft wide.

Who owns TR 408 over Drowning Fork?

It is owned by the Town or Township Highway Agency.