US Bridges

Johnson RD over Dumolin Canal

FairPosted for load

St. Martin Parish, Louisiana · 0.8 Mi. N. of LA 678 · Structure no. 035030213914971

Built
1970
55 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete
Length
38 ft
2 main spans
Daily traffic
226
2020 count
Owner
County
County Highway Agency

About this bridge

Johnson RD over Dumolin Canal is a concrete slab carrying Johnson RD over Dumolin Canal in St. Martin Parish, Louisiana. It was built in 1970, so it is 55 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. Its operating status is: posted for load restriction.

It carries about 226 vehicles a day, projected to reach 248 by 2040. The structure is 38 ft (11.6 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesJohnson RD
CrossesDumolin Canal
Location0.8 Mi. N. of LA 678
RouteCounty Highway 0
CountySt. Martin Parish
StateLouisiana
Coordinates30.35574, -91.82943
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating26.8 US tons
Inventory rating20.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span19 ft (5.8 m)
Deck width27 ft (8.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic226 (2020)
Projected traffic248 by 2040
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$160,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Johnson RD over Dumolin Canal built?

It was built in 1970, making it 55 years old in 2025.

What condition is Johnson RD over Dumolin Canal 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 RD over Dumolin Canal carry?

About 226 vehicles per day (2020 count).

How long is Johnson RD over Dumolin Canal?

The structure is 38 ft (11.6 m) long with a longest span of 19 ft (5.8 m) and a deck 27 ft wide.

Who owns Johnson RD over Dumolin Canal?

It is owned by the County Highway Agency.