Terrebonne Parish, Louisiana

Survey Area LA109• Louisiana

The dominant drainage class is Very poorly drained and the dominant hydrologic group is D (very slow infiltration, high runoff). The most common soil order is Histosols — organic soils (peat/muck) formed in wetlands. This report summarizes the major soil map units across the survey area to help you understand what to expect when buying, building, or gardening in Terrebonne Parish, Louisiana. Search your address to find the exact soil composition, drainage, and series details at your specific location.

Soil Map Unit	Acres	Drainage	Hydro Group	Dwellings	Septic
Water	309K			Not rated	Not rated
Kenner muck, 0 to 1 percent slopes, very frequently flooded	116K	Very poorly drained	D	Very limited	Very limited
Allemands muck, 0 to 0.2 percent slopes, very frequently flooded	71K	Very poorly drained	A/D	Very limited	Very limited
Timbalier muck, 0 to 0.2 percent slopes, tidal	69K	Very poorly drained	A/D	Very limited	Very limited
Clovelly muck, slightly saline, tidal	52K	Very poorly drained	D	Very limited	Very limited
Barbary muck, 0 to 1 percent slopes, frequently flooded	46K	Very poorly drained	D	Very limited	Very limited
Bellpass muck, 0 to 0.2 percent slopes, very frequently flooded	40K	Very poorly drained	D	Very limited	Very limited
Lafitte muck, slightly saline, tidal	36K	Very poorly drained	A/D	Very limited	Very limited
Fausse clay, 0 to 1 percent slopes, frequently flooded	31K	Very poorly drained	D	Very limited	Very limited
Clovelly muck, very slightly saline, tidal	25K	Very poorly drained	A/D	Very limited	Very limited
Schriever clay, 0 to 1 percent slopes, rarely flooded	25K	Poorly drained	D	Very limited	Very limited
Scatlake muck, 0 to 0.2 percent slopes, tidal	25K	Very poorly drained	D	Very limited	Very limited
Cancienne silty clay loam, 0 to 1 percent slopes	22K	Somewhat poorly drained	C	Somewhat limited	Very limited
Aquents, dredged, 1 to 5 percent slopes, occasionally flooded	21K	Very poorly drained	D	Not rated	Not rated
Lafitte muck, very slightly saline, tidal	20K	Very poorly drained	A/D	Very limited	Very limited
Larose muck, 0 to 0.5 percent slopes, tidal	19K	Very poorly drained	C/D	Very limited	Very limited
Schriever clay, 0 to 1 percent slopes, occasionally flooded	19K	Poorly drained	D	Very limited	Very limited
Schriever clay, 0 to 1 percent slopes, frequently flooded	18K	Poorly drained	D	Very limited	Very limited
Allemands and Carlin soils, 0 to 0.2 percent slopes, very frequently flooded	16K	Very poorly drained	A/D	Very limited	Very limited
Cancienne silt loam, 0 to 1 percent slopes	13K	Somewhat poorly drained	C	Somewhat limited	Very limited

Soil Orders in This Area

The USDA classifies every soil into one of 12 soil orders. Here are the dominant orders found in this survey area.

Histosols

Organic peat and muck soils formed in wetlands. Very poor for building (compressible) and septic. Often in regulated wetlands.

Entisols

Young soils with little development — found on floodplains, dunes, and steep slopes. Properties vary widely by setting.

Inceptisols

Young but developing soils found in mountains and river terraces. Variable properties — check drainage and bedrock depth.

Vertisols

High-clay soils that shrink and swell dramatically. Fertile but challenging for foundations and septic systems.

What This Means

Building & Foundations

About 63% of soils are rated "very limited" for dwellings with basements. Specific challenges include poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.

Septic Systems

About 66% of soils are rated "very limited" for septic absorption fields. Poorly drained soils can't absorb septic effluent effectively. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.

Gardening & Agriculture

Many soils hold water for extended periods. Raised beds are highly recommended to improve drainage for vegetables. Well-adapted native plants and water-loving species will do best in natural conditions.