US Bridges

TR 561 over Br.Prairie Cr.

Good

LaSalle County, Illinois · N 6th E 1060 · Structure no. 050324500000000

Built
1936
89 years old, rebuilt 1994
Condition
Good
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
43 ft
1 main span
Daily traffic
25
2016 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 561 over Br.Prairie Cr. is a prestressed concrete box beam or girders - multiple carrying TR 561 over Br.Prairie Cr. in LaSalle County, Illinois. It was built in 1936 and reconstructed in 1994, so it is 89 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 25 vehicles a day, projected to reach 25 by 2046. The structure is 43 ft (13.1 m) long and 26 ft wide.

CarriesTR 561
CrossesBr.Prairie Cr.
LocationN 6th E 1060
RouteCounty Highway 0
Coordinates41.01486, -88.95842
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.6 US tons
Inventory rating41.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 15
Structure length43 ft (13.1 m)
Longest span40 ft (12.1 m)
Deck width26 ft (7.9 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2016)
Projected traffic25 by 2046
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 561 over Br.Prairie Cr. built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1994.

What condition is TR 561 over Br.Prairie Cr. 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 June 2024.

How much traffic does TR 561 over Br.Prairie Cr. carry?

About 25 vehicles per day (2016 count).

How long is TR 561 over Br.Prairie Cr.?

The structure is 43 ft (13.1 m) long with a longest span of 40 ft (12.1 m) and a deck 26 ft wide.

Who owns TR 561 over Br.Prairie Cr.?

It is owned by the Town or Township Highway Agency.