US Bridges

TR-186 Risdon Sch over Doza Creek

Fair

St. Clair County, Illinois · 1.5MI West of Ch 27 · Structure no. 082413700000000

Built
1998
27 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
110 ft
3 main spans
Daily traffic
75
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR-186 Risdon Sch over Doza Creek is a prestressed concrete box beam or girders - multiple carrying TR-186 Risdon Sch over Doza Creek in St. Clair County, Illinois. It was built in 1998, so it is 27 years old, younger 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 75 vehicles a day, roughly 17% of them trucks, projected to reach 76 by 2046. The structure is 110 ft (33.5 m) long and 24 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesTR-186 Risdon Sch
CrossesDoza Creek
Location1.5MI West of Ch 27
RouteCounty Highway 0
CountySt. Clair County
StateIllinois
Coordinates38.23518, -89.88372
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length110 ft (33.5 m)
Longest span48 ft (14.6 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2023)
Projected traffic76 by 2046
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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-186 Risdon Sch over Doza Creek built?

It was built in 1998, making it 27 years old in 2025.

What condition is TR-186 Risdon Sch over Doza 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 June 2024.

How much traffic does TR-186 Risdon Sch over Doza Creek carry?

About 75 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is TR-186 Risdon Sch over Doza Creek?

The structure is 110 ft (33.5 m) long with a longest span of 48 ft (14.6 m) and a deck 24 ft wide.

Who owns TR-186 Risdon Sch over Doza Creek?

It is owned by the Town or Township Highway Agency.