Estimated two-day rainfall ending August 13, 2016. Map: NOAA National Weather Service, Lower Mississippi River Forecast Center.
Livingston Parish, home to Denham Springs, Walker and Watson, grew for years without a zoning map. This summer, The Advocate reported that the parish “had long managed with no zoning and decades-old development rules.” That changed on July 23, 2026, when the Parish Council adopted a Unified Development Code.
The council’s vote matters to developers first. But it also raises a quieter question for ordinary homeowners: what happens when a family orders a few truckloads of dirt to raise a low corner of the yard, fill a ditch, or pad a shed site? The short answer is that the new code does not settle that question in public reporting, and residents should not assume either way.
The Advocate’s Gigi Liman reported on July 24 that the council adopted the code, “capping a yearslong effort to control how and where land is developed.” According to that report, the 243-page document sets “what can be built where,” governs “how land may be split into lots,” and lays out “how new construction must handle drainage and flooding.”
The most concrete drainage provision in the coverage applies to larger projects. “Large commercial, industrial and residential projects must now produce drainage and traffic studies” before approval, the paper reported. Council members framed the code as a living document, one that “holds all the rules in one place but can be amended over time.”
Council President John Mangus put the history bluntly in the same article: “We were the wild, wild West without zoning and the UDC.” Council member Erin Sandefur tied the gap directly to drainage, saying the lack of rules “created so many challenges for our people with infrastructure, drainage, electricity, gas, roads.”
The Advocate reported that the code would next go to Parish President Randy Delatte’s office for his signature. As of mid-October 2026, I could not find a public record confirming the signature date or an effective date. The parish’s planning, zoning, and permit pages, as checked on October 16, did not post the adopted text.
That gap matters. Without the final ordinance, nobody outside parish government can say with confidence how the code treats residential fill, on-site detention, or building in mapped floodplains. The news coverage does not mention fill at all. Any homeowner planning grading work should treat the rules as something to confirm, not something to infer from a headline.
The code’s origin is not abstract. The Advocate reported that the effort “began after the historic August 2016 flood.” The rain fell from August 11 through August 13, and the National Weather Service summary of the August 2016 flood records 25.52 inches at its Livingston gauge. The same summary says “estimates range from 50,000 to 75,000 structures flooded from this event.”
Rainfall at the Livingston gauge by day. Source: National Weather Service.
NOAA’s Climate.gov reported at the time that the Amite River at Denham Springs crested at 46.2 feet, “breaking the old 1983 record by almost 5 feet.” The Advocate’s July story put the local toll in household terms: 20,808 households, about half the parish’s homes, were hit by the flood.
Those numbers explain why drainage studies now come attached to major projects. They also explain why fill dirt is a politically sensitive material in the Amite River basin. Every cubic yard placed in a floodplain takes up space that water once occupied.
Stations with more than 20 inches of rain. Source: National Weather Service.
The federal framework is already published and specific. FEMA’s glossary entry on fill explains that earthen fill is sometimes placed in a Special Flood Hazard Area to reduce flood risk to the filled ground. The same entry states that “The placement of fill is considered development and will require a permit.”
FEMA adds that fill “is prohibited within the floodway unless it has been demonstrated” that it will not raise flood levels. It also notes that “Some communities limit the use of fill in the flood fringe to protect storage capacity or require compensatory storage.” In plain terms, some local governments require that the volume added in one place be offset by an equal volume removed elsewhere.
That federal language applies through local floodplain administration, which is why the parish permit office, not a dirt supplier or a neighbor, is the right first call. A small load in a backyard outside a mapped flood zone may raise no issue. The same load inside one could require a permit. I am not offering legal advice here, and the specific answer depends on the lot.
Neighboring Ascension Parish confronted fill directly years earlier. In July 2019, WBRZ reported that the Ascension council approved a temporary pause on projects that needed fill dirt for elevation, citing worry “about the potential for flooding.” According to that report, the pause “only applies to new construction that has not issued a permit.”
A second Ascension proposal at the time set a three-foot cap on fill elevations, and WBRZ reported that under it, “Anything higher must use pillars.” I have not confirmed the final terms Ascension adopted, so the comparison here is limited to the debate itself. It shows that parishes in the basin have treated fill as a drainage question, not only a construction detail.
Residents do not have to wait for the full code to post online. The Livingston Parish government website offers a “Request for Flood Zone Determination” form through its Building and Permit page. The parish lists (225) 686-2266 as its main number, with office hours of 7 a.m. to 5 p.m., Monday through Thursday.
A flood zone answer is the sensible starting point before ordering material. It tells a homeowner which set of rules might apply before money is spent. After that, the practical math of quantity is its own exercise, and a recent guide to ordering small loads of dirt and gravel in Livingston Parish, published on Idea Crossing, walks through sizing those orders.
Two other habits help. Keep a record of what was placed, where, and when. Also ask the permit office directly about grading near ditches, drainage servitudes, or a neighbor’s property line, since small changes there tend to move water onto someone else.
The reported framing of the code as amendable is worth taking at face value. Council members described it as a document that can be amended over time. How it treats small residential grading may be one of the areas that gets clarified once the text is published and permit staff begins applying it.
For now, the verified record is narrow: a new code exists, it addresses drainage and flooding for new construction, large projects must submit drainage studies, and its public text and effective date were not posted when this article was written.
The parish spent a decade rebuilding after 2016 with few land-use tools. The new code gives it more of them. How far those tools reach to the backyard scale will depend less on the July vote than on how permit staff read the text in the months ahead, and on how many residents ask before they dig.
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