US Bridges

W Blackcat RD over I-55

Good

Tangipahoa Parish, Louisiana · 1.9 M N of LA 442 · Structure no. 625304529024061

Built
1970
55 years old
Condition
Good
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
232 ft
4 main spans
Daily traffic
3,610
2015 count
Owner
State
State Highway Agency

About this bridge

W Blackcat RD over I-55 is a prestressed concrete stringer/multi-beam or girder carrying W Blackcat RD over I-55 in Tangipahoa Parish, Louisiana. It was built in 1970, so it is 55 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,610 vehicles a day, projected to reach 3,971 by 2035. The structure is 232 ft (70.7 m) long and 30 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesW Blackcat RD
CrossesI-55
Location1.9 M N of LA 442
RouteCounty Highway 0
CountyTangipahoa Parish
StateLouisiana
Coordinates30.60673, -90.51264
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length232 ft (70.7 m)
Longest span75 ft (22.9 m)
Deck width30 ft (9.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,610 (2015)
Projected traffic3,971 by 2035
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was W Blackcat RD over I-55 built?

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

What condition is W Blackcat RD over I-55 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2025.

How much traffic does W Blackcat RD over I-55 carry?

About 3,610 vehicles per day (2015 count).

How long is W Blackcat RD over I-55?

The structure is 232 ft (70.7 m) long with a longest span of 75 ft (22.9 m) and a deck 30 ft wide.

Who owns W Blackcat RD over I-55?

It is owned by the State Highway Agency.