US Bridges

Fish Hatchery Rd. over I-12

Fair

St. Tammany Parish, Louisiana · 1.0 M W of LA 434 · Structure no. 625204540420071

Built
1976
49 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
279 ft
4 main spans
Daily traffic
4,410
2015 count
Owner
State
State Highway Agency

About this bridge

Fish Hatchery Rd. over I-12 is a prestressed concrete stringer/multi-beam or girder carrying Fish Hatchery Rd. over I-12 in St. Tammany Parish, Louisiana. It was built in 1976, so it is 49 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 4,410 vehicles a day, projected to reach 4,851 by 2035. The structure is 279 ft (85 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesFish Hatchery Rd.
CrossesI-12
Location1.0 M W of LA 434
RouteCounty Highway 0
CountySt. Tammany Parish
StateLouisiana
Coordinates30.36103, -89.938
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionAugust 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 geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length279 ft (85 m)
Longest span92 ft (28 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,410 (2015)
Projected traffic4,851 by 2035
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
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
NavigationNot applicable (no waterway)

Frequently asked questions

When was Fish Hatchery Rd. over I-12 built?

It was built in 1976, making it 49 years old in 2025.

What condition is Fish Hatchery Rd. over I-12 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 Fish Hatchery Rd. over I-12 carry?

About 4,410 vehicles per day (2015 count).

How long is Fish Hatchery Rd. over I-12?

The structure is 279 ft (85 m) long with a longest span of 92 ft (28 m) and a deck 30 ft wide.

Who owns Fish Hatchery Rd. over I-12?

It is owned by the State Highway Agency.