US Bridges

I0010 over Bayou Nazpique

Fair

Acadia Parish, Louisiana · 0.4 MI East of LA 97 · Structure no. 030104500400001

Built
1961
64 years old, rebuilt 1974
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
1,587 ft
29 main spans
Daily traffic
36,670
2021 count
Owner
State
State Highway Agency

About this bridge

I0010 over Bayou Nazpique is a steel stringer/multi-beam or girder carrying I0010 over Bayou Nazpique in Acadia Parish, Louisiana. It was built in 1961 and reconstructed in 1974, so it is 64 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 36,670 vehicles a day, roughly 22% of them trucks, projected to reach 40,337 by 2041. The structure is 1,587 ft (483.7 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI0010
CrossesBayou Nazpique
Location0.4 MI East of LA 97
RouteInterstate 10
CountyAcadia Parish
StateLouisiana
Coordinates30.24073, -92.62453
Functional classRural Principal Arterial - Interstate

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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78 US tons
Inventory rating47 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans29
Design loadHS 20
Structure length1,587 ft (483.7 m)
Longest span125 ft (38.1 m)
Deck width41 ft (12.4 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36,670 (2021)
Projected traffic40,337 by 2041
Trucks22%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
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 proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I0010 over Bayou Nazpique built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1974.

What condition is I0010 over Bayou Nazpique 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 March 2023.

How much traffic does I0010 over Bayou Nazpique carry?

About 36,670 vehicles per day (2021 count), of which roughly 22% are trucks.

How long is I0010 over Bayou Nazpique?

The structure is 1,587 ft (483.7 m) long with a longest span of 125 ft (38.1 m) and a deck 41 ft wide.

Who owns I0010 over Bayou Nazpique?

It is owned by the State Highway Agency.