US Bridges

I 55 over US 51

Fair

Grenada County, Mississippi · I 55 over US 51 · Structure no. 11000550222084A

Built
1965
60 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
185 ft
3 main spans
Daily traffic
9,000
2023 count
Owner
State
State Highway Agency

About this bridge

I 55 over US 51 is a prestressed concrete stringer/multi-beam or girder carrying I 55 over US 51 in Grenada County, Mississippi. It was built in 1965, so it is 60 years old, older 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 9,000 vehicles a day, roughly 26% of them trucks, projected to reach 10,500 by 2043. The structure is 185 ft (56.4 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 55
CrossesUS 51
LocationI 55 over US 51
RouteInterstate 55
CountyGrenada County
StateMississippi
Coordinates33.82378, -89.83918
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.3 US tons
Inventory rating46.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length185 ft (56.4 m)
Longest span60 ft (18.3 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,000 (2023)
Projected traffic10,500 by 2043
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$193 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 55 over US 51 built?

It was built in 1965, making it 60 years old in 2025.

What condition is I 55 over US 51 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 I 55 over US 51 carry?

About 9,000 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is I 55 over US 51?

The structure is 185 ft (56.4 m) long with a longest span of 60 ft (18.3 m) and a deck 30 ft wide.

Who owns I 55 over US 51?

It is owned by the State Highway Agency.