USDA SSURGO COUNTY SOIL REFERENCE

Mobile County, Alabama Soil Summary

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

Mapped Land Coverage
99.96%1,051,792.55 mapped acres of 1,052,193.35 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
Wadley loamy fine sand, 0 to 5 percent slopes
Symbol: WaB6.12% of mapped area
Largest estimated component
Wadley
164,301.18 acres (15.62% 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 A
Runoff potential classification
Weighted average slope
4.8%
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 Mobile County ranked by intersected vector acreage
SymbolMap Unit NameMapped Acres% of Mapped Area
WaBWadley loamy fine sand, 0 to 5 percent slopes64,362.746.12%
WhDWadley-Heidel complex, 8 to 15 percent slopes60,715.125.77%
MbF2Maubila-Olla-Rattlesnake Forks complex, 8 to 35 percent slopes, moderately eroded60,6525.77%
WhEWadley-Heidel complex, 15 to 25 percent slopes50,827.134.83%
JBAJohnston, Bibb and Pamlico soils, 0 to 1 percent slopes, frequently flooded46,6544.44%
WWater40,040.113.81%
HeBHeidel fine sandy loam, 2 to 5 percent slopes36,351.273.46%
StAStallings (gulf)-Bayou complex, 0 to 2 percent slopes26,405.322.51%
UbAUrban land, 0 to 8 percent slopes21,460.692.04%
WhCWadley-Heidel complex, 2 to 8 percent slopes20,796.081.98%
BuCBenndale-Urban land complex, 0 to 8 percent slopes20,605.451.96%
JPAJohnston, Pamlico and Dorovan soils, 0 to 1 percent slopes, frequently flooded20,427.711.94%
CtDChatom-Toinette-Rutan complex, 5 to 15 percent slopes19,912.511.89%
WaCWadley loamy fine sand, 5 to 8 percent slopes19,849.41.89%
WuCWadley-Urban land complex, 0 to 8 percent slopes19,636.871.87%

Estimated Soil Components

Component acreage estimated from SSURGO component percentages
ComponentDrainage ClassHydrologic GroupEstimated Acres% of Mapped Area
WadleySomewhat excessively drainedA164,301.1815.62%
HeidelWell drainedA75,759.757.2%
Urban landUnspecifiedUnspecified48,262.334.59%
BenndaleWell drainedB46,424.934.41%
WaterUnspecifiedUnspecified41,849.753.98%
BibbPoorly drainedB/D, A/D, C/D36,019.033.42%
JohnstonVery poorly drainedC/D34,680.933.3%
Rattlesnake ForksSomewhat excessively drainedB, A33,376.73.17%
BamaWell drainedA31,073.622.95%
MaubilaModerately well drainedD27,293.42.59%
MalbisWell drainedC25,8522.46%
SmithtonPoorly drainedB/D22,656.982.15%
PamlicoVery poorly drainedA/D21,234.582.02%
BayouPoorly drainedA/D20,350.751.93%
AtmorePoorly drainedB/D, A/D20,230.971.92%
Component acreage is estimated from SSURGO map-unit component percentages. Component values are not independently mapped polygon boundaries.

Drainage Class Distribution

Well drained24.21%
254,656.37 acres
Somewhat excessively drained19.94%
209,746.26 acres
Poorly drained11.64%
122,389.21 acres
Very poorly drained11.09%
116,679.95 acres
Moderately well drained9.53%
100,213.75 acres
Unknown / Unmapped8.57%
90,112.08 acres
Somewhat poorly drained4.11%
43,232.8 acres
Excessively drained0.57%
6,004.06 acres

Hydrologic Soil Group Distribution

Group A31.02%
326,228.41 acres
Group C/D12.17%
128,003.96 acres
Group Unknown / Unmapped9.79%
102,959.64 acres
Group B/D9.69%
101,914.07 acres
Group B8.69%
91,379.22 acres
Group A/D7.49%
78,743.34 acres
Group C6.26%
65,893.98 acres
Group D4.56%
47,911.86 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: 4.8%
Nearly Level (0-2%)42.08%
442,584.03 acres
Gently Sloping (2-8%)26.04%
273,885.53 acres
Moderately Sloping (8-15%)13.7%
144,053.47 acres
Steep (15-30%)3.87%
40,661.7 acres
Very Steep (>30%)0%
0 acres
Unspecified Slope3.98%
41,849.75 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).