US Bridges

TR 85 (TH-C69) over Senachwine Creek

Poor

Marshall County, Illinois · T12N-R9E-4PM Sec 29 · Structure no. 062504500000000

Built
1977
48 years old
Condition
Poor
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
126 ft
3 main spans
Daily traffic
50
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 85 (TH-C69) over Senachwine Creek is a prestressed concrete box beam or girders - multiple carrying TR 85 (TH-C69) over Senachwine Creek in Marshall 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 50 vehicles a day, roughly 20% of them trucks, projected to reach 51 by 2046. The structure is 126 ft (38.4 m) long and 21 ft wide.

Location

Open in Google Maps
CarriesTR 85 (TH-C69)
CrossesSenachwine Creek
LocationT12N-R9E-4PM Sec 29
RouteCounty Highway 0
CountyMarshall County
StateIllinois
Coordinates41.00248, -89.50205
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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating63.9 US tons
Inventory rating38.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length126 ft (38.4 m)
Longest span60 ft (18.3 m)
Deck width21 ft (6.4 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2024)
Projected traffic51 by 2046
Trucks20%
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 85 (TH-C69) over Senachwine Creek built?

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

What condition is TR 85 (TH-C69) over Senachwine Creek 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 August 2023.

How much traffic does TR 85 (TH-C69) over Senachwine Creek carry?

About 50 vehicles per day (2024 count), of which roughly 20% are trucks.

How long is TR 85 (TH-C69) over Senachwine Creek?

The structure is 126 ft (38.4 m) long with a longest span of 60 ft (18.3 m) and a deck 21 ft wide.

Who owns TR 85 (TH-C69) over Senachwine Creek?

It is owned by the Town or Township Highway Agency.