US Bridges

Ill 34 over M Fork B Muddy River

Fair

Franklin County, Illinois · 2.2 MI E Benton · Structure no. 028004300000000

Built
1957
68 years old, rebuilt 2001
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
150 ft
3 main spans
Daily traffic
3,650
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 34 over M Fork B Muddy River is a steel continuous stringer/multi-beam or girder carrying Ill 34 over M Fork B Muddy River in Franklin County, Illinois. It was built in 1957 and reconstructed in 2001, so it is 68 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 3,650 vehicles a day, roughly 10% of them trucks, projected to reach 3,838 by 2046. The structure is 150 ft (45.7 m) long and 39 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesIll 34
CrossesM Fork B Muddy River
Location2.2 MI E Benton
RouteState Highway 34
CountyFranklin County
StateIllinois
Coordinates37.98604, -88.86572
Functional classRural Minor Arterial

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 inspectionOctober 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating60.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length150 ft (45.7 m)
Longest span54 ft (16.5 m)
Deck width39 ft (11.8 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,650 (2023)
Projected traffic3,838 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$512,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Ill 34 over M Fork B Muddy River built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 2001.

What condition is Ill 34 over M Fork B Muddy 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 October 2023.

How much traffic does Ill 34 over M Fork B Muddy River carry?

About 3,650 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Ill 34 over M Fork B Muddy River?

The structure is 150 ft (45.7 m) long with a longest span of 54 ft (16.5 m) and a deck 39 ft wide.

Who owns Ill 34 over M Fork B Muddy River?

It is owned by the State Highway Agency.