US Bridges

TR 306 over Flour Creek

PoorPosted for load

Hancock County, Illinois · 2.0 MI W Augusta · Structure no. 034360400000000

Built
1969
56 years old
Condition
Poor
inspected March 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
34 ft
1 main span
Daily traffic
50
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 306 over Flour Creek is a prestressed concrete box beam or girders - multiple carrying TR 306 over Flour Creek in Hancock County, Illinois. It was built in 1969, so it is 56 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. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, roughly 14% of them trucks, projected to reach 76 by 2046. The structure is 34 ft (10.4 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesTR 306
CrossesFlour Creek
Location2.0 MI W Augusta
RouteCounty Highway 0
Coordinates40.24249, -90.98811
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
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.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating66 US tons
Inventory rating20 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 15
Structure length34 ft (10.4 m)
Longest span31 ft (9.6 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic76 by 2046
Trucks14%
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 306 over Flour Creek built?

It was built in 1969, making it 56 years old in 2025.

What condition is TR 306 over Flour 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 March 2023.

How much traffic does TR 306 over Flour Creek carry?

About 50 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is TR 306 over Flour Creek?

The structure is 34 ft (10.4 m) long with a longest span of 31 ft (9.6 m) and a deck 26 ft wide.

Who owns TR 306 over Flour Creek?

It is owned by the Town or Township Highway Agency.