USDA SSURGO COUNTY SOIL REFERENCE

Madison County, Alabama Soil Summary

This page summarizes USDA SSURGO mapped soil information for Madison County, Alabama.

Mapped Land Coverage
100%520,137.7 mapped acres of 520,137.72 Census land acres

Coverage measures mapped SSURGO intersection with Census land geometry. It does not mean that every parcel or point has complete soil information.

Soil at a Glance

Largest mapped soil unit
Sharkey clay, 0 to 1 percent slopes, rarely flooded, south
Symbol: Sc1.92% of mapped area
Largest estimated component
Sharkey
12,922.17 acres (2.48% of mapped area)
Mapped units & components
15 soil units • 15 component series
Distinct SSURGO map units & series
Dominant drainage class
Well drained
Highest acreage drainage class
Dominant hydrologic group
Group B
Runoff potential classification
Weighted average slope
11%
Terrain slope analysis
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County summaries provide regional context across mapped soil units. Address lookup combines available public datasets for the Census-matched location.

Mapped SSURGO Soil Units

Largest mapped soil units in Madison County ranked by intersected vector acreage
SymbolMap Unit NameMapped Acres% of Mapped Area
ScSharkey clay, 0 to 1 percent slopes, rarely flooded, south10,005.851.92%
94Oro Fino-Poin complex, 15 to 45 percent slopes6,383.281.23%
KoKokomo silty clay loam, 0 to 2 percent slopes6,058.211.16%
15Enders-Leesburg complex, 8 to 20 percent slopes5,937.631.14%
16Enders-Leesburg complex, 20 to 40 percent slopes5,534.751.06%
74Dorovan and Pamlico soils, depressional4,695.370.9%
CsBCrosby-Lewisburg silt loams, 2 to 6 percent slopes4,557.830.88%
73140Clarksville-Scholten complex, 15 to 45 percent slopes, very stony4,473.80.86%
6778Nora-Crofton complex, 6 to 11 percent slopes, eroded4,404.860.85%
CrACrosby silt loam, fine-loamy subsoil, 0 to 2 percent slopes4,365.010.84%
RsRockland, limestone, steep3,872.070.74%
5Blanton sand, 0 to 5 percent slopes3,857.450.74%
DbB2Decatur silty clay loam, 2 to 6 percent slopes, eroded3,821.90.73%
119Sebud-Hapgood-Rock outcrop complex, 25 to 60 percent slopes3,546.290.68%
TsTensas-Sharkey complex, 0 to 3 percent slopes, gently undulating3,506.150.67%

Estimated Soil Components

Component acreage estimated from SSURGO component percentages
ComponentDrainage ClassHydrologic GroupEstimated Acres% of Mapped Area
SharkeyPoorly drainedD12,922.172.48%
MadisonWell drainedB12,741.72.45%
CrosbySomewhat poorly drainedC/D9,157.41.76%
CecilWell drainedB9,029.011.74%
Rock outcropUnspecifiedD8,676.51.67%
WaterSubaqueousD7,480.431.44%
EndersWell drainedC, D7,365.891.42%
LoringModerately well drainedC, D, C/D6,692.551.29%
KokomoVery poorly drained, Poorly drainedC/D6,093.11.17%
CragoWell drainedB5,763.321.11%
ProvidenceModerately well drainedC, C/D5,501.411.06%
SmithdaleWell drainedB5,078.150.98%
KalstedSomewhat excessively drained, Well drainedA5,007.90.96%
LeesburgWell drainedB4,919.070.95%
ClarksvilleSomewhat excessively drainedB, A4,757.930.91%
Component acreage is estimated from SSURGO map-unit component percentages. Component values are not independently mapped polygon boundaries.

Drainage Class Distribution

Well drained49.98%
259,939.55 acres
Moderately well drained15.66%
81,439.84 acres
Somewhat poorly drained11.19%
58,200.9 acres
Poorly drained8.46%
44,016.96 acres
Unknown / Unmapped4.88%
25,365.75 acres
Very poorly drained3.56%
18,529.26 acres
Somewhat excessively drained2.72%
14,128.64 acres
Excessively drained1.41%
7,329.84 acres
Subaqueous0.02%
88.69 acres

Hydrologic Soil Group Distribution

Group B31.52%
163,972.76 acres
Group C17.46%
90,830.01 acres
Group D17.25%
89,745.54 acres
Group C/D10.84%
56,367.04 acres
Group A8.6%
44,751.11 acres
Group B/D5.83%
30,329.26 acres
Group Unknown / Unmapped3.9%
20,281.22 acres
Group A/D2.45%
12,762.48 acres

Hydrologic soil groups are USDA/NRCS classifications related to runoff potential under specified soil conditions. They are not a property-level flood-risk rating.

Slope Characteristics

Weighted Average Slope: 11%
Nearly Level (0-2%)29.59%
153,891.02 acres
Gently Sloping (2-8%)28.48%
148,134.87 acres
Moderately Sloping (8-15%)12.28%
63,867.64 acres
Steep (15-30%)15.78%
82,064.2 acres
Very Steep (>30%)7.08%
36,833.92 acres
Unspecified Slope4.66%
24,247.77 acres

Sources & Methodology

USDA NRCS SSURGO

Mapped soil units, components, drainage classes, hydrologic groups, and slope ratings derived from official Soil Data Access REST services.

U.S. Census Bureau TIGER/Line

County land geometry used for county-level coverage calculation.

Coverage Method

Mapped acreage is calculated from true spatial vector intersection of county land geometry and SSURGO mapped soil polygons using NAD83 / CONUS Albers Equal Area projection (EPSG:5070).