US Bridges

Chatsworth Rd. over Franklin Canal

Fair

St. Mary Parish, Louisiana · 1.2 MI S of LA 3211 · Structure no. 035129471913141

Built
1985
40 years old
Condition
Fair
inspected April 2023
Type
Movable - Swing
Steel
Length
202 ft
2 main spans
Daily traffic
1,950
2022 count
Owner
County
County Highway Agency

About this bridge

Chatsworth Rd. over Franklin Canal is a steel movable - swing carrying Chatsworth Rd. over Franklin Canal in St. Mary Parish, Louisiana. It was built in 1985, so it is 40 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 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 1,950 vehicles a day, projected to reach 2,145 by 2042. The structure is 202 ft (61.6 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesChatsworth Rd.
CrossesFranklin Canal
Location1.2 MI S of LA 3211
RouteCounty Highway 0
CountySt. Mary Parish
StateLouisiana
Coordinates29.78523, -91.52346
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating30 US tons
Inventory rating23.3 US tons

Structure

Structure typeMovable - Swing
MaterialSteel
DeckWood or timber
Main spans2 (+3 approach)
Design loadHS 20
Structure length202 ft (61.6 m)
Longest span94 ft (28.7 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,950 (2022)
Projected traffic2,145 by 2042
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Chatsworth Rd. over Franklin Canal built?

It was built in 1985, making it 40 years old in 2025.

What condition is Chatsworth Rd. over Franklin 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 April 2023.

How much traffic does Chatsworth Rd. over Franklin Canal carry?

About 1,950 vehicles per day (2022 count).

How long is Chatsworth Rd. over Franklin Canal?

The structure is 202 ft (61.6 m) long with a longest span of 94 ft (28.7 m) and a deck 35 ft wide.

Who owns Chatsworth Rd. over Franklin Canal?

It is owned by the County Highway Agency.