US Bridges

TR 8 over Main Ditch North

Good

Mercer County, Illinois · SW-24-T15NR6W · Structure no. 066552100000000

Built
2007
18 years old
Condition
Good
inspected December 2021
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
64 ft
1 main span
Daily traffic
10
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 8 over Main Ditch North is a prestressed concrete box beam or girders - multiple carrying TR 8 over Main Ditch North in Mercer County, Illinois. It was built in 2007, so it is 18 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 10 vehicles a day, projected to reach 10 by 2046. The structure is 64 ft (19.5 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesTR 8
CrossesMain Ditch North
LocationSW-24-T15NR6W
RouteCounty Highway 0
Coordinates41.27738, -91.03564
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionDecember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length64 ft (19.5 m)
Longest span61 ft (18.7 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2024)
Projected traffic10 by 2046
Trucks0%
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 8 over Main Ditch North built?

It was built in 2007, making it 18 years old in 2025.

What condition is TR 8 over Main Ditch North in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2021.

How much traffic does TR 8 over Main Ditch North carry?

About 10 vehicles per day (2024 count).

How long is TR 8 over Main Ditch North?

The structure is 64 ft (19.5 m) long with a longest span of 61 ft (18.7 m) and a deck 24 ft wide.

Who owns TR 8 over Main Ditch North?

It is owned by the Town or Township Highway Agency.