US Bridges

I 55 over Tangipahoa River Relief

Fair

Pike County, Mississippi · 0.8 MI N SR 568 · Structure no. 110005505700860

Built
1960
65 years old
Condition
Fair
inspected November 2024
Type
Culvert
Concrete
Length
43 ft
2 main spans
Daily traffic
18,000
2023 count
Owner
State
State Highway Agency

About this bridge

I 55 over Tangipahoa River Relief is a concrete culvert carrying I 55 over Tangipahoa River Relief in Pike County, Mississippi. It was built in 1960, so it is 65 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 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 18,000 vehicles a day, roughly 28% of them trucks, projected to reach 18,000 by 2043. The structure is 43 ft (13.1 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI 55
CrossesTangipahoa River Relief
Location0.8 MI N SR 568
RouteInterstate 55
Coordinates31.12269, -90.48333
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 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 rating51.6 US tons
Inventory rating30.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length43 ft (13.1 m)
Longest span20 ft (6.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,000 (2023)
Projected traffic18,000 by 2043
Trucks28%
Lanes on structure40
Traffic directionTwo-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 55 over Tangipahoa River Relief built?

It was built in 1960, making it 65 years old in 2025.

What condition is I 55 over Tangipahoa River 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 November 2024.

How much traffic does I 55 over Tangipahoa River Relief carry?

About 18,000 vehicles per day (2023 count), of which roughly 28% are trucks.

How long is I 55 over Tangipahoa River Relief?

The structure is 43 ft (13.1 m) long with a longest span of 20 ft (6.1 m).

Who owns I 55 over Tangipahoa River Relief?

It is owned by the State Highway Agency.