US Bridges

LA0427 over Dawson Cr.Brg.(acadian)

Fair

East Baton Rouge Parish, Louisiana · 0.1 M S of I-10 · Structure no. 611702580203371

Built
1964
61 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete
Length
100 ft
5 main spans
Daily traffic
22,447
2021 count
Owner
State
State Highway Agency

About this bridge

LA0427 over Dawson Cr.Brg.(acadian) is a concrete slab carrying LA0427 over Dawson Cr.Brg.(acadian) in East Baton Rouge Parish, Louisiana. It was built in 1964, so it is 61 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 22,447 vehicles a day, roughly 9% of them trucks, projected to reach 24,691 by 2041. The structure is 100 ft (30.5 m) long and 72 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesLA0427
CrossesDawson Cr.Brg.(acadian)
Location0.1 M S of I-10
RouteState Highway 427
CountyEast Baton Rouge Parish
StateLouisiana
Coordinates30.42325, -91.15143
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.8 US tons
Inventory rating28.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span20 ft (6.1 m)
Deck width72 ft (21.9 m)
Roadway width63 ft (19.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,447 (2021)
Projected traffic24,691 by 2041
Trucks9%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0427 over Dawson Cr.Brg.(acadian) built?

It was built in 1964, making it 61 years old in 2025.

What condition is LA0427 over Dawson Cr.Brg.(acadian) 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 LA0427 over Dawson Cr.Brg.(acadian) carry?

About 22,447 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is LA0427 over Dawson Cr.Brg.(acadian)?

The structure is 100 ft (30.5 m) long with a longest span of 20 ft (6.1 m) and a deck 72 ft wide.

Who owns LA0427 over Dawson Cr.Brg.(acadian)?

It is owned by the State Highway Agency.