US Bridges

TR-370 over Granny Tweedle Ditch

Fair

White County, Illinois · 4 MI NE New Haven · Structure no. 097320800000000

Built
1990
35 years old
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
42 ft
1 main span
Daily traffic
150
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR-370 over Granny Tweedle Ditch is a prestressed concrete box beam or girders - multiple carrying TR-370 over Granny Tweedle Ditch in White County, Illinois. It was built in 1990, so it is 35 years old, younger 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 150 vehicles a day, roughly 31% of them trucks, projected to reach 101 by 2046. The structure is 42 ft (12.7 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesTR-370
CrossesGranny Tweedle Ditch
Location4 MI NE New Haven
RouteCounty Highway 0
CountyWhite County
StateIllinois
Coordinates37.96561, -88.05711
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
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 length42 ft (12.7 m)
Longest span39 ft (11.9 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2024)
Projected traffic101 by 2046
Trucks31%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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-370 over Granny Tweedle Ditch built?

It was built in 1990, making it 35 years old in 2025.

What condition is TR-370 over Granny Tweedle Ditch 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 March 2023.

How much traffic does TR-370 over Granny Tweedle Ditch carry?

About 150 vehicles per day (2024 count), of which roughly 31% are trucks.

How long is TR-370 over Granny Tweedle Ditch?

The structure is 42 ft (12.7 m) long with a longest span of 39 ft (11.9 m) and a deck 24 ft wide.

Who owns TR-370 over Granny Tweedle Ditch?

It is owned by the Town or Township Highway Agency.