USDA SSURGO COUNTY SOIL REFERENCE

Jefferson County, Alabama Soil Summary

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

Mapped Land Coverage
99.94%719,014.88 mapped acres of 719,455.76 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
Montevallo-Nauvoo association, 6 to 45 percent slopes
Symbol: 291.48% of mapped area
Largest estimated component
Rock outcrop
29,384.91 acres (4.09% 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 D
Runoff potential classification
Weighted average slope
15.38%
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 Jefferson County ranked by intersected vector acreage
SymbolMap Unit NameMapped Acres% of Mapped Area
29Montevallo-Nauvoo association, 6 to 45 percent slopes10,640.931.48%
WWater8,716.11.21%
CrACrowley-Vidrine complex, 0 to 1 percent slopes5,969.870.83%
26Perry clay, 0 to 1 percent slopes5,760.470.8%
ZwBZaneis-Pawhuska complex, 0 to 3 percent slopes5,658.860.79%
ZvDZaneis, Lucien, and Grainola soils, 5 to 12 percent slopes4,320.060.6%
CQRock outcrop, cirques, 40 to 80 percent slopes3,538.560.49%
41EBerks-Weikert complex, 35 to 60 percent slopes3,362.260.47%
46Sphinx-Rock outcrop complex, 15 to 80 percent slopes3,289.060.46%
290BLeighcan family, till substratum, 5 to 40 percent slopes3,284.960.46%
922AMoran family-Rock outcrop-Teewinot family complex, 40 to 80 percent slopes3,251.70.45%
704SLeighcan-Endlich families complex, 40 to 60 percent slopes3,195.260.44%
73201Sonsac gravelly silt loam, 15 to 40 percent slopes, very stony3,150.330.44%
367BScout-Angostura families complex, 5 to 40 percent slopes3,135.830.44%
33Rilla silt loam, 0 to 1 percent slopes3,093.80.43%

Estimated Soil Components

Component acreage estimated from SSURGO component percentages
ComponentDrainage ClassHydrologic GroupEstimated Acres% of Mapped Area
Rock outcropUnspecifiedD29,384.914.09%
WaterSubaqueousD23,050.523.21%
Leighcan familySomewhat excessively drained, Well drainedB, C13,100.911.82%
Urban landUnspecifiedD10,934.41.52%
SphinxSomewhat excessively drainedD8,669.461.21%
NauvooWell drainedB7,485.831.04%
GilpinWell drainedC7,274.011.01%
PerryPoorly drainedC, D6,853.40.95%
MontevalloWell drainedD5,633.160.78%
CreteModerately well drainedC, C/D, D5,349.580.74%
ZaneisWell drainedB, C5,276.030.73%
SmithdaleWell drainedB4,565.380.63%
LapineExcessively drainedA4,479.080.62%
Legault familyExcessively drainedD4,116.050.57%
MemphisWell drainedB4,064.010.57%
Component acreage is estimated from SSURGO map-unit component percentages. Component values are not independently mapped polygon boundaries.

Drainage Class Distribution

Well drained40.79%
293,260.97 acres
Unknown / Unmapped11.27%
81,023.09 acres
Moderately well drained10.56%
75,922.43 acres
Somewhat excessively drained10.01%
71,979.1 acres
Somewhat poorly drained8.6%
61,866.92 acres
Poorly drained7.24%
52,039.19 acres
Excessively drained4.07%
29,296.05 acres
Very poorly drained3.45%
24,771.9 acres
Subaqueous0.04%
305.94 acres

Hydrologic Soil Group Distribution

Group D28.88%
207,676.44 acres
Group B21.02%
151,129.05 acres
Group C17.36%
124,854.36 acres
Group A8.95%
64,335.66 acres
Group Unknown / Unmapped8.81%
63,345.65 acres
Group C/D7.06%
50,749.04 acres
Group B/D2.52%
18,147.94 acres
Group A/D1.42%
10,227.45 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: 15.38%
Nearly Level (0-2%)27.97%
201,122.37 acres
Gently Sloping (2-8%)21.78%
156,597.43 acres
Moderately Sloping (8-15%)8.82%
63,420.4 acres
Steep (15-30%)13.31%
95,686.14 acres
Very Steep (>30%)15.68%
112,745.19 acres
Unspecified Slope8.47%
60,894.07 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).