US Bridges

FAS 731 over Nassa Cr.

Fair

Macoupin County, Illinois · 3 Mi. E. Modesto · Structure no. 059300100000000

Built
1927
98 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete
Length
26 ft
1 main span
Daily traffic
300
2021 count
Owner
County
County Highway Agency

About this bridge

FAS 731 over Nassa Cr. is a concrete slab carrying FAS 731 over Nassa Cr. in Macoupin County, Illinois. It was built in 1927, so it is 98 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 300 vehicles a day, roughly 10% of them trucks, projected to reach 303 by 2046. The structure is 26 ft (7.9 m) long and 22 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesFAS 731
CrossesNassa Cr.
Location3 Mi. E. Modesto
RouteCounty Highway 0
CountyMacoupin County
StateIllinois
Coordinates39.48205, -89.9291
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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span25 ft (7.6 m)
Deck width22 ft (6.8 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2021)
Projected traffic303 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 731 over Nassa Cr. built?

It was built in 1927, making it 98 years old in 2025.

What condition is FAS 731 over Nassa Cr. 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 March 2023.

How much traffic does FAS 731 over Nassa Cr. carry?

About 300 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is FAS 731 over Nassa Cr.?

The structure is 26 ft (7.9 m) long with a longest span of 25 ft (7.6 m) and a deck 22 ft wide.

Who owns FAS 731 over Nassa Cr.?

It is owned by the County Highway Agency.