US Bridges

FAS 579 over Mannel Branch

Fair

Cass County, Illinois · Nwcl Arenzville · Structure no. 009500200000000

Built
1964
61 years old
Condition
Fair
inspected January 2023
Type
Culvert
Concrete Continuous
Length
24 ft
2 main spans
Daily traffic
1,900
2023 count
Owner
County
County Highway Agency

About this bridge

FAS 579 over Mannel Branch is a concrete continuous culvert carrying FAS 579 over Mannel Branch in Cass County, Illinois. It was built in 1964, so it is 61 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 6 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 1,900 vehicles a day, roughly 15% of them trucks, projected to reach 1,869 by 2046. The structure is 24 ft (7.3 m) long and 44 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesFAS 579
CrossesMannel Branch
LocationNwcl Arenzville
RouteCounty Highway 0
CountyCass County
StateIllinois
Coordinates39.88647, -90.37905
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating24.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 15
Structure length24 ft (7.3 m)
Longest span12 ft (3.6 m)
Deck width44 ft (13.4 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,900 (2023)
Projected traffic1,869 by 2046
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 FAS 579 over Mannel Branch built?

It was built in 1964, making it 61 years old in 2025.

What condition is FAS 579 over Mannel Branch 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 January 2023.

How much traffic does FAS 579 over Mannel Branch carry?

About 1,900 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is FAS 579 over Mannel Branch?

The structure is 24 ft (7.3 m) long with a longest span of 12 ft (3.6 m) and a deck 44 ft wide.

Who owns FAS 579 over Mannel Branch?

It is owned by the County Highway Agency.