US Bridges

TR 320 over S Fork Mckee CR Trib

Fair

Pike County, Illinois · 2.25 NW Griggsville · Structure no. 075322400000000

Built
1983
42 years old
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
77 ft
3 main spans
Daily traffic
50
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 320 over S Fork Mckee CR Trib is a prestressed concrete box beam or girders - multiple carrying TR 320 over S Fork Mckee CR Trib in Pike County, Illinois. It was built in 1983, so it is 42 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 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 50 vehicles a day, projected to reach 58 by 2046. The structure is 77 ft (23.5 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesTR 320
CrossesS Fork Mckee CR Trib
Location2.25 NW Griggsville
RouteCounty Highway 0
CountyPike County
StateIllinois
Coordinates39.73501, -90.77965
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length77 ft (23.5 m)
Longest span25 ft (7.6 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic58 by 2046
Trucks0%
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 320 over S Fork Mckee CR Trib built?

It was built in 1983, making it 42 years old in 2025.

What condition is TR 320 over S Fork Mckee CR Trib 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 April 2023.

How much traffic does TR 320 over S Fork Mckee CR Trib carry?

About 50 vehicles per day (2023 count).

How long is TR 320 over S Fork Mckee CR Trib?

The structure is 77 ft (23.5 m) long with a longest span of 25 ft (7.6 m) and a deck 28 ft wide.

Who owns TR 320 over S Fork Mckee CR Trib?

It is owned by the Town or Township Highway Agency.