US Bridges

CH-3-FAS 635 over Sangamon River

Fair

Christian County, Illinois · 0.10 MI W. Roby · Structure no. 011300300000000

Built
1965
60 years old, rebuilt 1999
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
618 ft
9 main spans
Daily traffic
700
2022 count
Owner
County
County Highway Agency

About this bridge

CH-3-FAS 635 over Sangamon River is a steel continuous stringer/multi-beam or girder carrying CH-3-FAS 635 over Sangamon River in Christian County, Illinois. It was built in 1965 and reconstructed in 1999, so it is 60 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 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 700 vehicles a day, roughly 9% of them trucks, projected to reach 732 by 2046. The structure is 618 ft (188.3 m) long and 34 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCH-3-FAS 635
CrossesSangamon River
Location0.10 MI W. Roby
RouteCounty Highway 0
CountyChristian County
StateIllinois
Coordinates39.74248, -89.40169
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20
Structure length618 ft (188.3 m)
Longest span110 ft (33.5 m)
Deck width34 ft (10.4 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic700 (2022)
Projected traffic732 by 2046
Trucks9%
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

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 CH-3-FAS 635 over Sangamon River built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1999.

What condition is CH-3-FAS 635 over Sangamon River 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 CH-3-FAS 635 over Sangamon River carry?

About 700 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is CH-3-FAS 635 over Sangamon River?

The structure is 618 ft (188.3 m) long with a longest span of 110 ft (33.5 m) and a deck 34 ft wide.

Who owns CH-3-FAS 635 over Sangamon River?

It is owned by the County Highway Agency.