US Bridges

FAU8198/S Johnson over Town Brook

Fair

Morgan County, Illinois · S Johnson @ Brook · Structure no. 069603000000000

Built
1997
28 years old
Condition
Fair
inspected May 2022
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
47 ft
1 main span
Daily traffic
200
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

FAU8198/S Johnson over Town Brook is a prestressed concrete box beam or girders - multiple carrying FAU8198/S Johnson over Town Brook in Morgan County, Illinois. It was built in 1997, so it is 28 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 200 vehicles a day, roughly 12% of them trucks, projected to reach 202 by 2046. The structure is 47 ft (14.3 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesFAU8198/S Johnson
CrossesTown Brook
LocationS Johnson @ Brook
CountyMorgan County
StateIllinois
Coordinates39.73041, -90.21049
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2022
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 rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length47 ft (14.3 m)
Longest span45 ft (13.6 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2024)
Projected traffic202 by 2046
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 FAU8198/S Johnson over Town Brook built?

It was built in 1997, making it 28 years old in 2025.

What condition is FAU8198/S Johnson over Town Brook 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 May 2022.

How much traffic does FAU8198/S Johnson over Town Brook carry?

About 200 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is FAU8198/S Johnson over Town Brook?

The structure is 47 ft (14.3 m) long with a longest span of 45 ft (13.6 m) and a deck 30 ft wide.

Who owns FAU8198/S Johnson over Town Brook?

It is owned by the City or Municipal Highway Agency.