US Bridges

US0051-B over I-55

Fair

Tangipahoa Parish, Louisiana · US0051 · Structure no. 625308533600501

Built
1960
65 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
1,041 ft
23 main spans
Daily traffic
2,434
2021 count
Owner
State
State Highway Agency

About this bridge

US0051-B over I-55 is a steel stringer/multi-beam or girder carrying US0051-B over I-55 in Tangipahoa Parish, Louisiana. It was built in 1960, so it is 65 years old, older than the Louisiana average of 43 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 2,434 vehicles a day, roughly 8% of them trucks, projected to reach 2,677 by 2041. The structure is 1,041 ft (317.3 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS0051-B
CrossesI-55
LocationUS0051
RouteU.S. Route 51
CountyTangipahoa Parish
StateLouisiana
Coordinates30.41449, -90.4346
Functional classUrban Minor Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating66 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans23
Design loadHS 20
Structure length1,041 ft (317.3 m)
Longest span83 ft (25.3 m)
Deck width33 ft (10.2 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,434 (2021)
Projected traffic2,677 by 2041
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US0051-B over I-55 built?

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

What condition is US0051-B over I-55 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 February 2023.

How much traffic does US0051-B over I-55 carry?

About 2,434 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is US0051-B over I-55?

The structure is 1,041 ft (317.3 m) long with a longest span of 83 ft (25.3 m) and a deck 33 ft wide.

Who owns US0051-B over I-55?

It is owned by the State Highway Agency.