US Bridges

Roachtown Roadtr 8 over Douglas Creek

Good

St. Clair County, Illinois · 1.49 MI S. Ill 158 · Structure no. 082412500000000

Built
1991
34 years old
Condition
Good
inspected February 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
92 ft
3 main spans
Daily traffic
800
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Roachtown Roadtr 8 over Douglas Creek is a prestressed concrete box beam or girders - multiple carrying Roachtown Roadtr 8 over Douglas Creek in St. Clair County, Illinois. It was built in 1991, so it is 34 years old, younger 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 800 vehicles a day, roughly 8% of them trucks, projected to reach 657 by 2046. The structure is 92 ft (27.9 m) long and 28 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesRoachtown Roadtr 8
CrossesDouglas Creek
Location1.49 MI S. Ill 158
RouteCounty Highway 0
CountySt. Clair County
StateIllinois
Coordinates38.45983, -90.04083
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
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 rating48.9 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 length92 ft (27.9 m)
Longest span30 ft (9.1 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic800 (2023)
Projected traffic657 by 2046
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Roachtown Roadtr 8 over Douglas Creek built?

It was built in 1991, making it 34 years old in 2025.

What condition is Roachtown Roadtr 8 over Douglas Creek 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 February 2023.

How much traffic does Roachtown Roadtr 8 over Douglas Creek carry?

About 800 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Roachtown Roadtr 8 over Douglas Creek?

The structure is 92 ft (27.9 m) long with a longest span of 30 ft (9.1 m) and a deck 28 ft wide.

Who owns Roachtown Roadtr 8 over Douglas Creek?

It is owned by the Town or Township Highway Agency.