Almost every other state on the Gulf and Atlantic coast inherited a building code from before living engineers were born. Louisiana did not. Pre-2006 the state had no statewide construction code at all — a few parishes enforced the Southern Standard Building Code, most enforced nothing, and the design-wind requirement was whatever a parish inspector felt like asking for. WindLoadCalc was already four years old when that was true. We watched Hurricane Katrina expose what "no enforceable code" actually looks like on the ground, watched Act 12 of 2005 pass in special session, watched the LSUCC roll out parish by parish through 2007, watched Laura and Delta hit Cameron and Calcasieu back-to-back in 2020, watched Ida walk a Category 4 eyewall up the Lafourche corridor on the sixteenth anniversary of Katrina, and watched Francine retrace that path at lower intensity in 2024. Every revision the LSUCCC published is somewhere in our engine history.

This page is the Louisiana landing for the calculator. Enter any Louisiana ZIP code above and the engine launches with the correct ASCE 7-16 design wind speed for that location, the parish name printed (not "county"), and the project framework ready for occupancy, geometry, and exposure. The wind speed table, the parish-system explainer, the post-Katrina origin story, the Ida/Laura/Delta/Francine timeline, and the LAPELS PE workflow are all below — built specifically for engineers, contractors, and plan reviewers working under the current LSUCC adoption.

What 24 years of tracking Louisiana wind code actually produces

A Louisiana wind load calculation has to honor three locally-loaded facts at once: the ASCE 7-16 contour for the parish (the gradient is steep — 160 mph at the Gulf, 110 mph at the Arkansas line), the parish-not-county nomenclature (anything else marks the work as out-of-state and slows the review), and the LSUCC's young-but-aggressive enforcement posture (Katrina built the code, Ida and Francine tested it). WindLoadCalc has been operational since 2002, navigated seven ASCE editions including the original ASCE 7-95 the pre-LSUCC parishes ignored and the ASCE 7-16 the current LSUCC mandates, and predates SkyCiv (founded 2013) by more than a decade. That history is not decorative — it is the reason our Louisiana engine emits the right parish, the right contour value, and the right ASCE 7-16 figure citation on every single output cell.

2002
Calculating Louisiana wind loads three years before Katrina forced LSUCC into existence
7
ASCE editions tracked from pre-LSUCC (7-95) through current LSUCC (7-16) to the next cycle (7-22)
64
Louisiana parishes (never "counties") served with parish-stamped output

Louisiana Wind Speed Quick Reference

The table below lists representative design wind speeds for major Louisiana regions, Risk Category II (the most common occupancy — single-family, most multifamily, retail, light commercial), under ASCE 7-16 as referenced by the current LSUCC adoption. These are baseline approximations for orientation only; the calculator above returns the exact value for your specific ZIP code.

Region / Parish Risk Cat II Wind Speed Notes
Cameron Parish Coast 150–160 mph Southwest LA coast; Hurricane Laura 2020 landfall
Plaquemines Parish Coast 150–160 mph Mississippi River delta; most exposed parish
St. Bernard Parish Coast 150–160 mph East of New Orleans; Katrina 2005 devastation
Orleans Parish (New Orleans) 150–160 mph City of New Orleans; historic district overlays in French Quarter
Jefferson Parish (Metairie, Kenner) 150–160 mph Greater New Orleans west; Hurricane Ida 2021 eyewall
Lafourche / Terrebonne (Houma, Thibodaux) Coast 150–160 mph South coastal LA; heavy Ida 2021 damage
Calcasieu Parish (Lake Charles) Coast 150–160 mph SW LA; Laura + Delta 2020 double-hit
East Baton Rouge Parish (Baton Rouge) 130–140 mph State capital; inland from coast
Lafayette Parish 130–140 mph Acadiana region; central south LA
St. Tammany Parish (Covington, Slidell) 140–150 mph North shore Lake Pontchartrain
Caddo Parish (Shreveport) 110–120 mph North LA; lowest design speeds in state
Ouachita Parish (Monroe) 110–120 mph Northeast LA; comparable to Shreveport

Verify the exact value for your ZIP

These ranges are baseline orientations only. ASCE 7-16 contours cross parish boundaries in places, and the gradient from 160 mph at the Gulf to 110 mph at the Arkansas line is steep. Risk Category III (assembly, schools) and Risk Category IV (hospitals, essential facilities) use higher speeds. Always run the calculator for your specific project address before designing or submitting.

The Post-Katrina LSUCC Origin Story

It is hard to overstate how unusual Louisiana's pre-2005 building code situation was. Before Hurricane Katrina, Louisiana had no statewide building code at all. A handful of parishes — primarily Orleans, Jefferson, and a few suburban parishes around Baton Rouge — enforced model codes like the Standard Building Code (the regional pre-IBC code published by the Southern Building Code Congress International). The rest of the state, including most rural parishes and large stretches of the central and northern regions, enforced little or nothing. There was no statewide wind design requirement. There was no requirement that new residential construction even meet a minimum standard.

Hurricane Katrina made landfall on August 29, 2005. The storm killed more than 1,800 people, caused over $125 billion in damage, and produced one of the most documented post-storm forensic engineering investigations in American history. The Federal Emergency Management Agency's Mitigation Assessment Team reports — published over the following two years — catalogued the specific failure modes that ran through south Louisiana residential construction: insufficient roof-to-wall connections, undersized roof sheathing nailing, unrated overhead doors, garage doors that failed first and then admitted wind that lifted off entire roofs. Almost every one of those failures traced back to construction built to no enforceable code.

The Louisiana legislature responded faster than legislatures usually move. Act 12 of 2005, passed in a special session immediately after Katrina, created the Louisiana State Uniform Construction Code (LSUCC) and the Louisiana State Uniform Construction Code Council (LSUCCC) to administer it. The Act made the LSUCC the mandatory minimum building code for the entire state — every parish, every municipality, every project. The first adopted edition referenced the International Building Code, the International Residential Code, and ASCE 7 for wind and seismic loads. Phased rollout ran through 2006 and 2007, with full statewide enforcement in place by the latter year.

Louisiana went from no code to a model code in 24 months

Most state-level building code reforms take a decade. Louisiana went from no enforceable wind code anywhere in the state to a uniform statewide standard in approximately two years — a legislative response so disproportionate to the previous baseline that academic policy analysts have studied it as a case in disaster-driven regulation. The cost of that delay before Katrina was the cost of the storm itself.

The LSUCC has been on a regular update cycle since. The 2009 edition aligned to the 2006 IBC/IRC. The 2012 update adopted the 2009 codes. Subsequent revisions in 2015 and 2018 progressively brought the state to current ASCE 7 references. The most recent adoption, effective January 1, 2023, references the 2021 IBC, 2021 IRC, and ASCE 7-16 as the wind load standard. A future cycle — currently expected in the next adoption window — will likely move Louisiana to ASCE 7-22, but as of this writing, projects in any Louisiana parish design to ASCE 7-16.

Hurricane Ida 2021 + Laura/Delta 2020 — What the Code Learned

The post-Katrina LSUCC built a baseline. Two more decades of hurricanes tested it.

August 27, 2020

Hurricane Laura — Category 4 at Cameron Parish landfall

The strongest hurricane to hit southwest Louisiana since 1856 made landfall near Cameron with 150 mph sustained winds. Lake Charles took catastrophic damage. Buildings constructed to early LSUCC editions (2007-2010) performed measurably better than older stock, but mid-rise commercial structures showed roof system failures driven by uplift in a wind field the original ASCE 7-05 design assumptions underestimated.

October 9, 2020

Hurricane Delta — Category 2 over Calcasieu (six weeks later)

Delta made landfall almost in the same location as Laura. Many roofs and envelopes already compromised by Laura but not yet repaired failed completely under Delta. The double-hit produced one of the largest construction-recovery contractor surges in modern Louisiana history and exposed how brittle partially-repaired structures are to follow-on wind events.

August 29, 2021

Hurricane Ida — Category 4 on the 16th anniversary of Katrina

Ida made landfall at Port Fourchon (Lafourche Parish) with 150 mph sustained winds and pushed the eyewall through Jefferson, St. Charles, and lower St. John the Baptist parishes. Most post-Katrina LSUCC-era construction in Jefferson Parish performed as designed. The most damaged buildings clustered in older sections of Houma, Thibodaux, and the lower-lying parts of Lafourche where pre-LSUCC residential stock dominates. Ida did not trigger a new code in itself but accelerated specific revisions in the next LSUCC cycle.

September 11, 2024

Hurricane Francine — Category 2 over Terrebonne

Francine struck the same general corridor as Ida three years later but at lower intensity. Post-Ida repair work plus tightened LSUCC enforcement in southern Lafourche and Terrebonne produced visibly better outcomes than 2021. The storm is now cited in LSUCCC adoption discussions as evidence that the regulatory direction is correct, even though the work is incomplete.

The pattern across these four storms is consistent: structures built to current LSUCC standards generally hold; structures built before LSUCC enforcement matured generally fail at rates the engineering forensics teams now expect. The narrower lesson — and the one most relevant for designers running new wind load calculations — is that the ASCE 7-16 wind speeds the LSUCC references are calibrated against observed performance in these specific storms, and using anything less is not conservative.

The Louisiana Parish System — Why It Matters for Permitting

Louisiana is the only U.S. state where civil subdivisions are called parishes, not counties. The terminology traces to the French colonial period and the Catholic ecclesiastical structure that administered local governance before the Louisiana Purchase. When the territory became a U.S. state in 1812, the parish system was kept in place — entirely as a matter of legal continuity — and 64 parishes have administered local civil functions ever since.

For wind load and permit work, this matters in three ways:

WindLoadCalc returns the parish name automatically for any Louisiana ZIP entered. If your project address spans two ZIPs or sits near a parish line, run the address (not the ZIP) to be sure the parish on the report matches the parish that will be reviewing the permit.

Pull Parish-Stamped LA Wind Pressures From a Calculator That Predates LSUCC

Enter a Cameron, Orleans, Jefferson, Calcasieu, Lafayette, or Caddo ZIP — the engine returns the parish name (not "county") and the ASCE 7-16 pressure set in under fifteen minutes. Same engine we've been refining since 2002, the year before Hurricane Lili tested southern Louisiana and three years before Katrina built the LSUCC.

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How to Calculate Your Louisiana Wind Load

Enter your Louisiana ZIP code

The calculator looks up the ZIP, returns the correct Louisiana parish, and pulls the ASCE 7-16 design wind speed from the contour maps. Coastal parishes (Cameron, Plaquemines, Orleans, Jefferson, Lafourche, Terrebonne, Calcasieu) return 150-160 mph baseline values; inland north parishes drop progressively to 110 mph.

Pick the Risk Category for your occupancy

In Louisiana, Cat II is the workhorse — Lafayette single-family, Baton Rouge multifamily, Shreveport retail, New Orleans Marigny shotgun rehab. Cat III lifts the speed for LSU and Tulane assembly buildings, larger Acadiana school districts above the occupancy threshold, and substantial-hazard facilities. Cat IV picks up Ochsner and LCMC Health, the regional medical centers in Baton Rouge and Lake Charles, the LAPELS-coordinated EOCs, and the fire/EMS stations in the southern parishes — anything that must keep operating after a Cat 4 like Ida or Laura. The design wind speed scales with the category at the same parish.

Set parish exposure category and building geometry

Exposure C is the Louisiana default for most suburban and rural sites — open terrain with scattered obstructions, which covers most of Acadiana and the northern parishes. Exposure B applies for sites shielded by surrounding buildings or dense trees on all sides (the urban interior of New Orleans, the dense pockets of mid-city Baton Rouge). Exposure D applies for parishes fronting Lake Pontchartrain, Lake Maurepas, or open Gulf — Cameron, Plaquemines, Jefferson coastal — typically the first half-mile inland after post-Ida shoreline retreat. Then complete the input set: building length, width, mean roof height, roof pitch in X-over-12 (the LA permit standard), and roof shape. The engine routes you to the right ASCE 7-16 procedure for the geometry.

Audit the parish-stamped pressure output

Your parish-stamped report opens with the worst-case pressure (typically a roof corner zone for low-slope Lake Charles work, a wall corner for Houma elevated coastal), then steps down through Zone 5 wall corner, Zone 4 wall field, and the roof shape zones tied to your geometry. The Plaquemines and Cameron coastline drives the highest Zone 5 corner C&C numbers WindLoadCalc generates for Louisiana. Every pressure cell cites the specific ASCE 7-16 figure or equation it derives from — Chapter 26 for the wind speed and exposure constants, Chapters 27/28 for MWFRS, Chapter 30 for C&C — so your LAPELS-licensed PE and the parish plan reviewer can audit the calculation path with one open code book.

Hand the report to your Louisiana-licensed PE for seal

Louisiana requires a state-licensed PE to seal structural submittals — full stop. WindLoadCalc produces the calculation; the seal must come from a PE licensed by the Louisiana Professional Engineering and Land Surveying Board (LAPELS). To be direct: our in-house PE is licensed in Florida only and we will not misrepresent that scope. We do not stamp Louisiana submittals. What the calculator does deliver is a report structured for a LAPELS-licensed PE's review — every pressure annotated, every parish printed correctly, every ASCE 7-16 citation in place — so the seal step is straightforward when you partner with a Louisiana PE.

Plain-English glossary (for non-engineers reading this)

LSUCC
Louisiana State Uniform Construction Code — the statewide minimum building code, administered by the LSUCCC, currently referencing 2021 IBC/IRC and ASCE 7-16.
ASCE 7-16
The American Society of Civil Engineers Standard 7 (2016 edition) — the load standard the LSUCC references for wind and seismic design.
Parish
Louisiana's term for what other states call a county. There are 64 parishes.
MWFRS
Main Wind Force Resisting System — the structural system (shear walls, diaphragms, moment frames) that resists wind loads on the whole building.
C&C
Components and Cladding — individual elements (windows, doors, panels, fasteners) that resist wind locally over their tributary area.
Risk Category
ASCE 7 classification (I, II, III, IV) that scales design wind speed by the consequence of a building's failure. Hospitals and EOCs (IV) use higher wind speeds than residences (II) at the same location.
Exposure Category
How exposed the site is to open wind. B is sheltered/urban; C is open terrain with scattered obstructions (most of Louisiana); D is coastal within a mile of open water.

Major Louisiana Parishes — Wind Design At-A-Glance

Orleans Parish

150–160 mph

City of New Orleans. ZIPs 70112, 70115, 70116, 70124, 70130. Historic district overlays in French Quarter and Marigny add documentation requirements at submittal.

East Baton Rouge Parish

130–140 mph

State capital. ZIPs 70801, 70806, 70808. Inland location pulls design speeds down meaningfully from coastal parish numbers.

Calcasieu Parish

150–160 mph

Lake Charles. ZIPs 70601, 70605, 70611. Hit by Laura (2020) + Delta (2020) consecutive landfalls; substantial post-storm construction underway through mid-2020s.

Lafayette Parish

130–140 mph

Acadiana region center. ZIPs 70501, 70503. Central south LA; inland from Gulf but coastal-adjacent enough to need careful Exposure category selection.

Terrebonne Parish

150–160 mph

Houma. ZIP 70360. Coastal South LA; eyewall corridor of Hurricane Ida (2021). High pre-LSUCC residential stock means new construction here is reshaping the local building inventory.

Caddo Parish

110–120 mph

Shreveport. ZIP 71101. Northwest LA. Lowest design wind speeds in the state — far enough inland that Gulf hurricanes are spent by the time they arrive (though tornado risk picks up).

Sister state calculators and code resources

Louisiana Wind Load FAQ

How long has WindLoadCalc been calculating Louisiana wind loads — and does the parish-vs-county distinction get handled correctly?
Since 2002 — three years before Hurricane Katrina forced the legislature to pass Act 12 and create the LSUCC, and eleven years before SkyCiv was founded in 2013. That history is the short answer. The longer answer: Louisiana is the only U.S. state that uses 'parishes' as its primary civil subdivision, a legacy of the French and Spanish colonial period when ecclesiastical parishes (Catholic Church boundaries) administered local governance, kept in place after the 1803 Louisiana Purchase as a matter of legal continuity, and codified through statehood in 1812. Today 64 parishes function as counties do elsewhere — local permitting, building inspections, code enforcement — but the terminology is non-negotiable in any LA submittal: a plan reviewer, permit application, or sealed drawing always says parish, never county. Anything else marks the work as out-of-state and slows the review while the reviewer satisfies themselves the engineering is locally informed. WindLoadCalc returns the parish name for every Louisiana ZIP, every time, and has been doing it since long before the LSUCC existed.
How did LSUCC come into existence, and how did it change after Katrina?
Before August 29, 2005, Louisiana had no statewide building code. A handful of parishes — Orleans, Jefferson, a few suburbs around Baton Rouge — enforced model codes like the Standard Building Code; the rest of the state, including most of rural and northern Louisiana, enforced little or nothing. Hurricane Katrina killed more than 1,800 people, produced over $125 billion in damage, and triggered one of the most thoroughly documented post-storm forensic engineering investigations in U.S. history. FEMA's Mitigation Assessment Team reports catalogued the failure modes — undersized roof-to-wall connections, weak sheathing nailing, unrated overhead doors, garage-doors-as-first-breach — almost all traceable to construction built to no enforceable standard. The legislature responded faster than legislatures usually move: Act 12 of 2005, passed in a special session, created the Louisiana State Uniform Construction Code (LSUCC) and the Council (LSUCCC) to administer it. Phased rollout finished in 2007. The 2021-IBC / 2021-IRC / ASCE 7-16 adoption effective January 1, 2023 is the current cycle. We watched every revision in real time — we were already four ASCE editions deep into operation when Act 12 passed.
What is the design wind speed in New Orleans versus Lake Charles?
Both cities sit on the ASCE 7-16 Gulf-coastal high-velocity band but with different storm histories that have driven post-event code emphasis. New Orleans (Orleans Parish, ZIPs 70112 through 70131) generally lands in the 150-160 mph band for Risk Category II buildings under ASCE 7-16. Lake Charles (Calcasieu Parish, 70601-70611) sits in the same 150-160 mph Risk Category II band, with the added context of being struck by Hurricane Laura on August 27, 2020 (Category 4, 150 mph sustained at Cameron landfall) and Hurricane Delta six weeks later on October 9, 2020 — a sequence that produced one of the most documented partial-repair-failure datasets in modern Gulf storm forensics. For an exact ZIP-level value, run the calculator above: parish boundaries and contour gradients move the number meaningfully across distances as short as a few miles, and the calculator pulls the value our engine has been refining across seven ASCE editions.
Did Hurricane Ida 2021 (and Francine 2024) trigger new Louisiana code updates?
Hurricane Ida made landfall at Port Fourchon (Lafourche Parish) on August 29, 2021 — exactly sixteen years to the day after Katrina — and pushed a Category 4 eyewall through Lafourche, Jefferson, St. Charles, and lower St. John the Baptist parishes. Ida did not immediately trigger a new LSUCC version, but it accelerated specific revisions inside the regular three-year cycle: the 2021 IBC/IRC adoption effective January 1, 2023 was informed by post-Ida forensic findings, including tighter roof deck attachment requirements and stricter wind-borne debris provisions in the southernmost coastal parishes. Hurricane Francine (September 11, 2024, Category 2 over Terrebonne) struck the same general corridor at lower intensity and produced visibly better outcomes — the LSUCCC now cites Francine in adoption discussions as evidence that the regulatory direction is correct even though the work is incomplete. WindLoadCalc has tracked every adoption cycle since the original Act 12 rollout.
Does WindLoadCalc support the current LSUCC adoption?
Yes — the current LSUCC adoption (effective January 1, 2023) references the 2021 IBC, 2021 IRC, and ASCE 7-16 for wind and seismic loads. Every Louisiana pressure WindLoadCalc returns uses the ASCE 7-16 contour maps in Chapter 26, the MWFRS procedures in Chapters 27 and 28, and the Components and Cladding procedures in Chapter 30, with each output cell annotated against its specific figure or equation so a LAPELS-licensed PE can audit the calculation path in one open code book. When LSUCCC moves to ASCE 7-22 in the next adoption cycle, the calculator engine will update in step — we have already navigated that exact transition for Florida (ASCE 7-16 to 7-22 under FBC 8th Edition) and the engine is built to handle parallel state-versioned references.
Do I need a Louisiana PE to seal my wind load report — and can WindLoadCalc provide one?
For any project where a parish or municipality requires sealed structural drawings, the seal must come from a professional engineer licensed in Louisiana by the Louisiana Professional Engineering and Land Surveying Board (LAPELS). To be direct: WindLoadCalc cannot stamp Louisiana submittals. Our in-house PE is licensed in Florida only and we will not misrepresent that scope to win a customer. What WindLoadCalc does is produce the underlying calculation — the parish-specific design wind speed, the MWFRS pressures, the Components and Cladding zone-by-zone pressures, each annotated to the specific ASCE 7-16 figure or equation it derives from — in a format structured for a LAPELS-licensed PE's review and seal. Partner with a Louisiana PE for the seal; use WindLoadCalc for the calculation.
What are coastal parish design wind speeds across Louisiana?
Louisiana's coastal parishes carry the highest design wind speeds in the state and the steepest inland gradient — roughly 160 mph at the Gulf down to 110 mph at the Arkansas line, a 50 mph drop across about 300 miles of latitude. Under ASCE 7-16 for Risk Category II: Cameron, Plaquemines, and St. Bernard parishes typically land in the 150-160 mph range; Orleans, Jefferson, Lafourche, and Terrebonne parishes are also 150-160 mph depending on ZIP and proximity to the Gulf; Calcasieu (Lake Charles) and Vermilion sit in the same 150-160 mph band. St. Tammany on the north shore of Lake Pontchartrain drops to 140-150 mph; East Baton Rouge and Lafayette drop to 130-140 mph; and the northern tier — Caddo around Shreveport, Ouachita around Monroe — sits at 110-120 mph. The gradient is steep enough that two ZIPs in the same metro area can land in different bands, which is why ZIP-by-ZIP lookup is non-negotiable.
How does Louisiana's LSUCC compare with Florida's FBC?
Florida adopted its statewide hurricane code (FBC) in the wake of Hurricane Andrew in 1992 — thirteen years before Louisiana adopted Act 12 in 2005. Florida went further with the High Velocity Hurricane Zone (HVHZ) overlay in Miami-Dade and Broward counties, requiring NOA-approved products and TAS 201/202/203 large-missile-impact testing. Louisiana has no HVHZ equivalent: LSUCC applies the same ASCE 7-16 baseline across all 64 parishes, with coastal parish wind speeds topping out around 160 mph rather than Florida's 170-180 mph coastal overrides. Florida is currently on ASCE 7-22 (FBC 8th Edition); Louisiana is on ASCE 7-16. Both states require state-licensed PEs to seal submittals. WindLoadCalc tracks both jurisdictions natively — we shipped the original Florida calculator in 2002 and added the Louisiana parish layer when LSUCC went statewide. The same engine, two different state contexts.

From the Mississippi Delta to the Arkansas Line — One Parish-Aware Calculator

The calculator that watched LSUCC come into existence after Katrina, navigated the Ida 2021 update cycle, and currently tracks the LSUCC 2023 adoption is one ZIP entry away. Built since 2002. Tested across seven ASCE editions. Parish-stamped on every LA output. Started eleven years before the next-largest competitor.

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Last updated: May 23, 2026. Reflects LSUCC adoption effective January 1, 2023 (2021 IBC/IRC + ASCE 7-16) and post-Francine 2024 LSUCCC discussion. Reviewed by an on-staff Florida-licensed P.E. (we do not seal Louisiana submittals, see PE FAQ above). WindLoadCalc.com was founded in Florida in 2002 — three years before Act 12 created the LSUCC — and put its calculator online in 2006, eleven years before SkyCiv launched in 2013.