US Bridges

Ill 166 over Sugar Creek

Fair

Williamson County, Illinois · At Ecl Creal Springs · Structure no. 100003100000000

Built
1933
92 years old, rebuilt 1980
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
74 ft
1 main span
Daily traffic
1,400
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 166 over Sugar Creek is a prestressed concrete box beam or girders - multiple carrying Ill 166 over Sugar Creek in Williamson County, Illinois. It was built in 1933 and reconstructed in 1980, so it is 92 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.

It carries about 1,400 vehicles a day, roughly 14% of them trucks, projected to reach 1,162 by 2046. The structure is 74 ft (22.5 m) long and 33 ft wide. If it were closed, the detour would be 26.7 mi (43 km).

Location

Open in Google Maps
CarriesIll 166
CrossesSugar Creek
LocationAt Ecl Creal Springs
RouteState Highway 166
CountyWilliamson County
StateIllinois
Coordinates37.61693, -88.82789
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, 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 above top of footing
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.6 US tons
Inventory rating46.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length74 ft (22.5 m)
Longest span70 ft (21.2 m)
Deck width33 ft (10.2 m)
Roadway width33 ft (10.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,400 (2023)
Projected traffic1,162 by 2046
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.7 mi (43 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Ill 166 over Sugar Creek built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1980.

What condition is Ill 166 over Sugar 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 November 2023.

How much traffic does Ill 166 over Sugar Creek carry?

About 1,400 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is Ill 166 over Sugar Creek?

The structure is 74 ft (22.5 m) long with a longest span of 70 ft (21.2 m) and a deck 33 ft wide.

Who owns Ill 166 over Sugar Creek?

It is owned by the State Highway Agency.