US Bridges

N Monroe ST(FAU743 over Spring Creek

Fair

Macon County, Illinois · N Side of Decatur · Structure no. 058304000000000

Built
1969
56 years old, rebuilt 1998
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
105 ft
3 main spans
Daily traffic
8,650
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

N Monroe ST(FAU743 over Spring Creek is a steel stringer/multi-beam or girder carrying N Monroe ST(FAU743 over Spring Creek in Macon County, Illinois. It was built in 1969 and reconstructed in 1998, so it is 56 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 8,650 vehicles a day, roughly 2% of them trucks, projected to reach 8,989 by 2046. The structure is 105 ft (32 m) long and 68 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesN Monroe ST(FAU743
CrossesSpring Creek
LocationN Side of Decatur
CountyMacon County
StateIllinois
Coordinates39.87269, -88.96392
Functional classUrban 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.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
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 rating64.3 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length105 ft (32 m)
Longest span41 ft (12.6 m)
Deck width68 ft (20.7 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,650 (2023)
Projected traffic8,989 by 2046
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.9 million
NavigationNo navigation control on waterway

Frequently asked questions

When was N Monroe ST(FAU743 over Spring Creek built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 1998.

What condition is N Monroe ST(FAU743 over Spring Creek 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 August 2023.

How much traffic does N Monroe ST(FAU743 over Spring Creek carry?

About 8,650 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is N Monroe ST(FAU743 over Spring Creek?

The structure is 105 ft (32 m) long with a longest span of 41 ft (12.6 m) and a deck 68 ft wide.

Who owns N Monroe ST(FAU743 over Spring Creek?

It is owned by the City or Municipal Highway Agency.