US Bridges

LA1264 over Innerharbor Navigation C

FairClosed to traffic

Orleans Parish, Louisiana · 0.5 Mi.W.Of Dowman R · Structure no. 023630019900211

Built
1975
50 years old
Condition
Fair
inspected August 2023
Type
Movable - Bascule
Steel
Length
1,942 ft
1 main span
Daily traffic
437
2021 count
Owner
State
State Highway Agency

About this bridge

LA1264 over Innerharbor Navigation C is a steel movable - bascule carrying LA1264 over Innerharbor Navigation C in Orleans Parish, Louisiana. It was built in 1975, so it is 50 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. Its operating status is: closed to all traffic.

It carries about 437 vehicles a day, roughly 11% of them trucks, projected to reach 480 by 2041. The structure is 1,942 ft (591.9 m) long and 69 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLA1264
CrossesInnerharbor Navigation C
Location0.5 Mi.W.Of Dowman R
RouteState Highway 1264
CountyOrleans Parish
StateLouisiana
Coordinates30.03263, -90.0314
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 12 months
Operating statusClosed to all traffic
ScourFoundations stable; scour above top of footing
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating10.4 US tons
Inventory rating7.8 US tons

Structure

Structure typeMovable - Bascule
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+36 approach)
Design loadHS 20
Structure length1,942 ft (591.9 m)
Longest span100 ft (30.5 m)
Deck width69 ft (20.9 m)
Roadway width57 ft (17.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic437 (2021)
Projected traffic480 by 2041
Trucks11%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was LA1264 over Innerharbor Navigation C built?

It was built in 1975, making it 50 years old in 2025.

What condition is LA1264 over Innerharbor Navigation C 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 LA1264 over Innerharbor Navigation C carry?

About 437 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA1264 over Innerharbor Navigation C?

The structure is 1,942 ft (591.9 m) long with a longest span of 100 ft (30.5 m) and a deck 69 ft wide.

Who owns LA1264 over Innerharbor Navigation C?

It is owned by the State Highway Agency.