US Bridges

Unionville Road over Davis Bayou

Fair

Massac County, Illinois · .56 MI E US45 · Structure no. 064304800000000

Built
1970
55 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete
Length
41 ft
3 main spans
Daily traffic
1,700
2020 count
Owner
County
County Highway Agency

About this bridge

Unionville Road over Davis Bayou is a concrete culvert carrying Unionville Road over Davis Bayou in Massac County, Illinois. It was built in 1970, so it is 55 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 1,700 vehicles a day, roughly 6% of them trucks, projected to reach 1,717 by 2046. The structure is 41 ft (12.5 m) long.

Location

Open in Google Maps
CarriesUnionville Road
CrossesDavis Bayou
Location.56 MI E US45
RouteCounty Highway 0
CountyMassac County
StateIllinois
Coordinates37.13045, -88.61867
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.5 US tons
Inventory rating28.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length41 ft (12.5 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,700 (2020)
Projected traffic1,717 by 2046
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 Unionville Road over Davis Bayou built?

It was built in 1970, making it 55 years old in 2025.

What condition is Unionville Road over Davis Bayou 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 November 2023.

How much traffic does Unionville Road over Davis Bayou carry?

About 1,700 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is Unionville Road over Davis Bayou?

The structure is 41 ft (12.5 m) long with a longest span of 12 ft (3.7 m).

Who owns Unionville Road over Davis Bayou?

It is owned by the County Highway Agency.