US Bridges

I 20 over Big Black Relief

Fair

Warren County, Mississippi · 0.4 MI W Hinds Cl · Structure no. 11000200750173B

Built
1992
33 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
442 ft
11 main spans
Daily traffic
18,500
2023 count
Owner
State
State Highway Agency

About this bridge

I 20 over Big Black Relief is a prestressed concrete continuous stringer/multi-beam or girder carrying I 20 over Big Black Relief in Warren County, Mississippi. It was built in 1992, so it is 33 years old, younger than the Mississippi average of 38.9 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 18,500 vehicles a day, roughly 36% of them trucks, projected to reach 21,500 by 2043. The structure is 442 ft (134.7 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 20
CrossesBig Black Relief
Location0.4 MI W Hinds Cl
RouteInterstate 20
CountyWarren County
StateMississippi
Coordinates32.35369, -90.63872
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating34.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans11
Design loadHS 20
Structure length442 ft (134.7 m)
Longest span40 ft (12.2 m)
Deck width45 ft (13.7 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,500 (2023)
Projected traffic21,500 by 2043
Trucks36%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I 20 over Big Black Relief built?

It was built in 1992, making it 33 years old in 2025.

What condition is I 20 over Big Black Relief 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 I 20 over Big Black Relief carry?

About 18,500 vehicles per day (2023 count), of which roughly 36% are trucks.

How long is I 20 over Big Black Relief?

The structure is 442 ft (134.7 m) long with a longest span of 40 ft (12.2 m) and a deck 45 ft wide.

Who owns I 20 over Big Black Relief?

It is owned by the State Highway Agency.