US Bridges

TR 18 over W Fork Spoon River

Poor

Bureau County, Illinois · 4 MI SW of Neponset · Structure no. 006426100000000

Built
1956
69 years old
Condition
Poor
inspected November 2023
Type
Channel Beam
Concrete
Length
58 ft
3 main spans
Daily traffic
75
2018 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 18 over W Fork Spoon River is a concrete channel beam carrying TR 18 over W Fork Spoon River in Bureau County, Illinois. It was built in 1956, so it is 69 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 75 vehicles a day, projected to reach 76 by 2046. The structure is 58 ft (17.7 m) long and 22 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesTR 18
CrossesW Fork Spoon River
Location4 MI SW of Neponset
RouteCounty Highway 0
CountyBureau County
StateIllinois
Coordinates41.24316, -89.82852
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.7 US tons
Inventory rating20.7 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 15
Structure length58 ft (17.7 m)
Longest span24 ft (7.3 m)
Deck width22 ft (6.8 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2018)
Projected traffic76 by 2046
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 18 over W Fork Spoon River built?

It was built in 1956, making it 69 years old in 2025.

What condition is TR 18 over W Fork Spoon River 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 November 2023.

How much traffic does TR 18 over W Fork Spoon River carry?

About 75 vehicles per day (2018 count).

How long is TR 18 over W Fork Spoon River?

The structure is 58 ft (17.7 m) long with a longest span of 24 ft (7.3 m) and a deck 22 ft wide.

Who owns TR 18 over W Fork Spoon River?

It is owned by the Town or Township Highway Agency.