US Bridges

Katy Bridge App RD over Teche Bayou

FairPosted for load

St. Mary Parish, Louisiana · 0.2 Mi. N of LA 182 · Structure no. 035129496913161

Built
1959
66 years old
Condition
Fair
inspected April 2023
Type
Movable - Swing
Steel
Length
386 ft
2 main spans
Daily traffic
1,050
2022 count
Owner
County
County Highway Agency

About this bridge

Katy Bridge App RD over Teche Bayou is a steel movable - swing carrying Katy Bridge App RD over Teche Bayou in St. Mary Parish, Louisiana. It was built in 1959, so it is 66 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 5 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 1,050 vehicles a day, projected to reach 1,155 by 2042. The structure is 386 ft (117.7 m) long and 30 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesKaty Bridge App RD
CrossesTeche Bayou
Location0.2 Mi. N of LA 182
RouteCounty Highway 0
CountySt. Mary Parish
StateLouisiana
Coordinates29.82638, -91.5276
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating19.3 US tons
Inventory rating15 US tons

Structure

Structure typeMovable - Swing
MaterialSteel
DeckOpen grating
Main spans2 (+10 approach)
Design loadH 15
Structure length386 ft (117.7 m)
Longest span92 ft (28 m)
Deck width30 ft (9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,050 (2022)
Projected traffic1,155 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Katy Bridge App RD over Teche Bayou built?

It was built in 1959, making it 66 years old in 2025.

What condition is Katy Bridge App RD over Teche 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 April 2023.

How much traffic does Katy Bridge App RD over Teche Bayou carry?

About 1,050 vehicles per day (2022 count).

How long is Katy Bridge App RD over Teche Bayou?

The structure is 386 ft (117.7 m) long with a longest span of 92 ft (28 m) and a deck 30 ft wide.

Who owns Katy Bridge App RD over Teche Bayou?

It is owned by the County Highway Agency.