US Bridges

Brownswitch RD over I-59

Fair

St. Tammany Parish, Louisiana · 0.4 MI E of LA 1091 · Structure no. 625204530100311

Built
1966
59 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
265 ft
4 main spans
Daily traffic
20,400
2015 count
Owner
State
State Highway Agency

About this bridge

Brownswitch RD over I-59 is a steel stringer/multi-beam or girder carrying Brownswitch RD over I-59 in St. Tammany Parish, Louisiana. It was built in 1966, so it is 59 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 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 20,400 vehicles a day, projected to reach 22,440 by 2035. The structure is 265 ft (80.8 m) long and 30 ft wide.

Location

Open in Google Maps
CarriesBrownswitch RD
CrossesI-59
Location0.4 MI E of LA 1091
RouteCounty Highway 0
CountySt. Tammany Parish
StateLouisiana
Coordinates30.31036, -89.71046
Functional classUrban Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2023
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 rating47 US tons
Inventory rating28 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length265 ft (80.8 m)
Longest span90 ft (27.4 m)
Deck width30 ft (9.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,400 (2015)
Projected traffic22,440 by 2035
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

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$1.2 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Brownswitch RD over I-59 built?

It was built in 1966, making it 59 years old in 2025.

What condition is Brownswitch RD over I-59 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 August 2023.

How much traffic does Brownswitch RD over I-59 carry?

About 20,400 vehicles per day (2015 count).

How long is Brownswitch RD over I-59?

The structure is 265 ft (80.8 m) long with a longest span of 90 ft (27.4 m) and a deck 30 ft wide.

Who owns Brownswitch RD over I-59?

It is owned by the State Highway Agency.