US Bridges

FAP-777 (ILL-185) over Vandalia Lake

Fair

Fayette County, Illinois · 3 MI NW Vandalia · Structure no. 026201500000000

Built
1966
59 years old
Condition
Fair
inspected March 2024
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
2,550
2023 count
Owner
State
State Highway Agency

About this bridge

FAP-777 (ILL-185) over Vandalia Lake is a concrete culvert carrying FAP-777 (ILL-185) over Vandalia Lake in Fayette County, Illinois. It was built in 1966, so it is 59 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 2,550 vehicles a day, roughly 11% of them trucks, projected to reach 3,213 by 2046. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 39.8 mi (64 km).

Location

Open in Google Maps
CarriesFAP-777 (ILL-185)
CrossesVandalia Lake
Location3 MI NW Vandalia
RouteState Highway 185
CountyFayette County
StateIllinois
Coordinates39.00888, -89.15779
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84.3 US tons
Inventory rating50.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length22 ft (6.7 m)
Longest span11 ft (3.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,550 (2023)
Projected traffic3,213 by 2046
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.8 mi (64 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 FAP-777 (ILL-185) over Vandalia Lake built?

It was built in 1966, making it 59 years old in 2025.

What condition is FAP-777 (ILL-185) over Vandalia Lake 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 2024.

How much traffic does FAP-777 (ILL-185) over Vandalia Lake carry?

About 2,550 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is FAP-777 (ILL-185) over Vandalia Lake?

The structure is 22 ft (6.7 m) long with a longest span of 11 ft (3.3 m).

Who owns FAP-777 (ILL-185) over Vandalia Lake?

It is owned by the State Highway Agency.