US Bridges

FAS 646 over Stream

Fair

Montgomery County, Illinois · 7.0 E of Nokomis · Structure no. 068327000000000

Built
1986
39 years old
Condition
Fair
inspected November 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
500
2020 count
Owner
County
County Highway Agency

About this bridge

FAS 646 over Stream is a prestressed concrete box beam or girders - multiple carrying FAS 646 over Stream in Montgomery County, Illinois. It was built in 1986, so it is 39 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 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 500 vehicles a day, roughly 14% of them trucks, projected to reach 505 by 2046. The structure is 31 ft (9.4 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesFAS 646
CrossesStream
Location7.0 E of Nokomis
RouteCounty Highway 0
CountyMontgomery County
StateIllinois
Coordinates39.2907, -89.14291
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum 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 spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width28 ft (8.6 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2020)
Projected traffic505 by 2046
Trucks14%
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

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 646 over Stream built?

It was built in 1986, making it 39 years old in 2025.

What condition is FAS 646 over Stream 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 2024.

How much traffic does FAS 646 over Stream carry?

About 500 vehicles per day (2020 count), of which roughly 14% are trucks.

How long is FAS 646 over Stream?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 28 ft wide.

Who owns FAS 646 over Stream?

It is owned by the County Highway Agency.