US Bridges

TR 31 over Drowning Fork

Fair

McDonough County, Illinois · N.CTR-22-T7NR1W · Structure no. 055410700000000

Built
1976
49 years old
Condition
Fair
inspected January 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
34 ft
1 main span
Daily traffic
275
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 31 over Drowning Fork is a prestressed concrete box beam or girders - multiple carrying TR 31 over Drowning Fork in McDonough County, Illinois. It was built in 1976, so it is 49 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 275 vehicles a day, roughly 5% of them trucks, projected to reach 278 by 2046. The structure is 34 ft (10.4 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesTR 31
CrossesDrowning Fork
LocationN.CTR-22-T7NR1W
RouteCounty Highway 0
CountyMcDonough County
StateIllinois
Coordinates40.58537, -90.49367
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
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 statusOpen, no 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 geometry6: Equal to present minimum criteria
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length34 ft (10.4 m)
Longest span33 ft (10.1 m)
Deck width28 ft (8.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic275 (2021)
Projected traffic278 by 2046
Trucks5%
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 31 over Drowning Fork built?

It was built in 1976, making it 49 years old in 2025.

What condition is TR 31 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 31 over Drowning Fork carry?

About 275 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is TR 31 over Drowning Fork?

The structure is 34 ft (10.4 m) long with a longest span of 33 ft (10.1 m) and a deck 28 ft wide.

Who owns TR 31 over Drowning Fork?

It is owned by the Town or Township Highway Agency.