US Bridges

TR 42 (TH-S17) over Thenius Creek

Fair

Marshall County, Illinois · T12N-R9E-4PM Sec 2 · Structure no. 062500300000000

Built
1978
47 years old
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
46 ft
1 main span
Daily traffic
25
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 42 (TH-S17) over Thenius Creek is a prestressed concrete box beam or girders - multiple carrying TR 42 (TH-S17) over Thenius Creek in Marshall County, Illinois. It was built in 1978, so it is 47 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 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 25 vehicles a day, projected to reach 25 by 2046. The structure is 46 ft (14 m) long and 21 ft wide.

Location

Open in Google Maps
CarriesTR 42 (TH-S17)
CrossesThenius Creek
LocationT12N-R9E-4PM Sec 2
RouteCounty Highway 0
CountyMarshall County
StateIllinois
Coordinates41.05504, -89.4442
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
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 + Mod
Structure length46 ft (14 m)
Longest span45 ft (13.7 m)
Deck width21 ft (6.4 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2024)
Projected traffic25 by 2046
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 42 (TH-S17) over Thenius Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is TR 42 (TH-S17) over Thenius Creek 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 August 2023.

How much traffic does TR 42 (TH-S17) over Thenius Creek carry?

About 25 vehicles per day (2024 count).

How long is TR 42 (TH-S17) over Thenius Creek?

The structure is 46 ft (14 m) long with a longest span of 45 ft (13.7 m) and a deck 21 ft wide.

Who owns TR 42 (TH-S17) over Thenius Creek?

It is owned by the Town or Township Highway Agency.