US Bridges

FAS 1870 over Marys River

Fair

Randolph County, Illinois · 1870 over Marys Rv · Structure no. 079302500000000

Built
1987
38 years old
Condition
Fair
inspected December 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
244 ft
4 main spans
Daily traffic
750
2024 count
Owner
County
County Highway Agency

About this bridge

FAS 1870 over Marys River is a prestressed concrete box beam or girders - multiple carrying FAS 1870 over Marys River in Randolph County, Illinois. It was built in 1987, so it is 38 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 750 vehicles a day, roughly 9% of them trucks, projected to reach 732 by 2046. The structure is 244 ft (74.4 m) long and 29 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesFAS 1870
CrossesMarys River
Location1870 over Marys Rv
RouteCounty Highway 0
CountyRandolph County
StateIllinois
Coordinates37.95628, -89.70646
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans4
Design loadHS 20
Structure length244 ft (74.4 m)
Longest span60 ft (18.3 m)
Deck width29 ft (8.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic750 (2024)
Projected traffic732 by 2046
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 1870 over Marys River built?

It was built in 1987, making it 38 years old in 2025.

What condition is FAS 1870 over Marys 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 December 2024.

How much traffic does FAS 1870 over Marys River carry?

About 750 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is FAS 1870 over Marys River?

The structure is 244 ft (74.4 m) long with a longest span of 60 ft (18.3 m) and a deck 29 ft wide.

Who owns FAS 1870 over Marys River?

It is owned by the County Highway Agency.