US Bridges

TR 379 over Whitney Slough

Good

Hancock County, Illinois · 2.06 MI W FAS 1600 · Structure no. 034521100000000

Built
2019
6 years old
Condition
Good
inspected March 2022
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
89 ft
3 main spans
Daily traffic
75
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 379 over Whitney Slough is a prestressed concrete box beam or girders - multiple carrying TR 379 over Whitney Slough in Hancock County, Illinois. It was built in 2019, so it is 6 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 75 vehicles a day, projected to reach 76 by 2046. The structure is 89 ft (27.2 m) long and 30 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesTR 379
CrossesWhitney Slough
Location2.06 MI W FAS 1600
RouteCounty Highway 0
CountyHancock County
StateIllinois
Coordinates40.26176, -91.44843
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 protection8 Very GoodNo problems noted.
Last inspectionMarch 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.6 US tons
Inventory rating52.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 25 or greater
Structure length89 ft (27.2 m)
Longest span28 ft (8.5 m)
Deck width30 ft (9.2 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2023)
Projected traffic76 by 2046
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 379 over Whitney Slough built?

It was built in 2019, making it 6 years old in 2025.

What condition is TR 379 over Whitney Slough 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 March 2022.

How much traffic does TR 379 over Whitney Slough carry?

About 75 vehicles per day (2023 count).

How long is TR 379 over Whitney Slough?

The structure is 89 ft (27.2 m) long with a longest span of 28 ft (8.5 m) and a deck 30 ft wide.

Who owns TR 379 over Whitney Slough?

It is owned by the Town or Township Highway Agency.