US Bridges

TR-173 (scott Road over Big Rock Creek

FairPosted for load

Kane County, Illinois · 2.0 MI NW Big Rock · Structure no. 045306700000000

Built
1960
65 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete Continuous
Length
71 ft
2 main spans
Daily traffic
175
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR-173 (scott Road over Big Rock Creek is a concrete continuous slab carrying TR-173 (scott Road over Big Rock Creek in Kane County, Illinois. It was built in 1960, so it is 65 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 175 vehicles a day, roughly 11% of them trucks, projected to reach 122 by 2046. The structure is 71 ft (21.7 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesTR-173 (scott Road
CrossesBig Rock Creek
Location2.0 MI NW Big Rock
RouteCounty Highway 0
CountyKane County
StateIllinois
Coordinates41.77999, -88.58966
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
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.6 US tons
Inventory rating22.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 15
Structure length71 ft (21.7 m)
Longest span35 ft (10.7 m)
Deck width28 ft (8.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic175 (2023)
Projected traffic122 by 2046
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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-173 (scott Road over Big Rock Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is TR-173 (scott Road over 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-173 (scott Road over Big Rock Creek carry?

About 175 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is TR-173 (scott Road over Big Rock Creek?

The structure is 71 ft (21.7 m) long with a longest span of 35 ft (10.7 m) and a deck 28 ft wide.

Who owns TR-173 (scott Road over Big Rock Creek?

It is owned by the Town or Township Highway Agency.