US Bridges

Nairn DR over Interstate 10

Fair

East Baton Rouge Parish, Louisiana · 0.2 Mi. N of LA 427 · Structure no. 611704501003201

Built
1968
57 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,026 ft
8 main spans
Daily traffic
84,950
2015 count
Owner
State
State Highway Agency

About this bridge

Nairn DR over Interstate 10 is a prestressed concrete stringer/multi-beam or girder carrying Nairn DR over Interstate 10 in East Baton Rouge Parish, Louisiana. It was built in 1968, so it is 57 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 84,950 vehicles a day, projected to reach 93,445 by 2035. The structure is 1,026 ft (312.7 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNairn DR
CrossesInterstate 10
Location0.2 Mi. N of LA 427
RouteCounty Highway 0
CountyEast Baton Rouge Parish
StateLouisiana
Coordinates30.42493, -91.14508
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating16.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans8 (+21 approach)
Design loadHS 20
Structure length1,026 ft (312.7 m)
Longest span83 ft (25.3 m)
Deck width42 ft (12.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic84,950 (2015)
Projected traffic93,445 by 2035
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nairn DR over Interstate 10 built?

It was built in 1968, making it 57 years old in 2025.

What condition is Nairn DR over Interstate 10 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 October 2024.

How much traffic does Nairn DR over Interstate 10 carry?

About 84,950 vehicles per day (2015 count).

How long is Nairn DR over Interstate 10?

The structure is 1,026 ft (312.7 m) long with a longest span of 83 ft (25.3 m) and a deck 42 ft wide.

Who owns Nairn DR over Interstate 10?

It is owned by the State Highway Agency.