US Bridges

TR-171 (owens Rd) over E Br Big Rock Creek

FairPosted for load

DeKalb County, Illinois · 1400N 1800E · Structure no. 019510100000000

Built
1957
68 years old
Condition
Fair
inspected April 2023
Type
Culvert
Concrete
Length
33 ft
3 main spans
Daily traffic
50
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR-171 (owens Rd) over E Br Big Rock Creek is a concrete culvert carrying TR-171 (owens Rd) over E Br Big Rock Creek in DeKalb County, Illinois. It was built in 1957, so it is 68 years old, older 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, projected to reach 56 by 2046. The structure is 33 ft (10 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesTR-171 (owens Rd)
CrossesE Br Big Rock Creek
Location1400N 1800E
RouteCounty Highway 0
CountyDeKalb County
StateIllinois
Coordinates41.83562, -88.60341
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.2 US tons
Inventory rating13.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 15
Structure length33 ft (10 m)
Longest span11 ft (3.3 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2021)
Projected traffic56 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-171 (owens Rd) over E Br Big Rock Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is TR-171 (owens Rd) over E Br Big Rock Creek 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-171 (owens Rd) over E Br Big Rock Creek carry?

About 50 vehicles per day (2021 count).

How long is TR-171 (owens Rd) over E Br Big Rock Creek?

The structure is 33 ft (10 m) long with a longest span of 11 ft (3.3 m) and a deck 32 ft wide.

Who owns TR-171 (owens Rd) over E Br Big Rock Creek?

It is owned by the Town or Township Highway Agency.