US Bridges

Johnson ST over San Patricio Bayou

Fair

De Soto Parish, Louisiana · 0.5 MI East of LA 513 · Structure no. 041632019934201

Built
1986
39 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete
Length
40 ft
2 main spans
Daily traffic
710
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Johnson ST over San Patricio Bayou is a concrete slab carrying Johnson ST over San Patricio Bayou in De Soto Parish, Louisiana. It was built in 1986, so it is 39 years old, younger 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 710 vehicles a day, projected to reach 781 by 2041. The structure is 40 ft (12.2 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesJohnson ST
CrossesSan Patricio Bayou
Location0.5 MI East of LA 513
RouteCounty Highway 0
CountyDe Soto Parish
StateLouisiana
Coordinates32.032, -93.70022
Functional classRural 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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating31.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span19 ft (5.8 m)
Deck width31 ft (9.4 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic710 (2021)
Projected traffic781 by 2041
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Johnson ST over San Patricio Bayou built?

It was built in 1986, making it 39 years old in 2025.

What condition is Johnson ST over San Patricio Bayou 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 Johnson ST over San Patricio Bayou carry?

About 710 vehicles per day (2021 count).

How long is Johnson ST over San Patricio Bayou?

The structure is 40 ft (12.2 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns Johnson ST over San Patricio Bayou?

It is owned by the City or Municipal Highway Agency.