USDA SSURGO COUNTY SOIL REFERENCE

Anchorage Municipality, Alaska Soil Summary

This page summarizes USDA SSURGO mapped soil information for Anchorage Municipality, Alaska.

Mapped Land Coverage
99.52%1,238,550.07 mapped acres of 1,244,480.67 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
Nakochna-Rock outcrop association, 20 to 85 percent slopes
Symbol: 4399.18% of mapped area
Largest estimated component
Deception
103,427.1 acres (8.35% 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
21.23%
Terrain slope analysis
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Mapped SSURGO Soil Units

Largest mapped soil units in Anchorage Municipality ranked by intersected vector acreage
SymbolMap Unit NameMapped Acres% of Mapped Area
439Nakochna-Rock outcrop association, 20 to 85 percent slopes113,682.749.18%
406Cryorthents and Urban land, 0 to 5 percent slopes98,181.527.93%
460Talkeetna-Chugach-Histic Cryaquepts association, cool, 10 to 70 percent slopes67,995.635.49%
407Cryorthents and Urban land, 5 to 20 percent slopes63,852.85.16%
414Deception-Estelle-Kichatna complex, undulating and hilly60,552.294.89%
401Andic Humicryods-Rock outcrop association, 25 to 85 percent slopes57,041.24.61%
423Hurdygurdy-Siwash-Rock outcrop association, 10 to 70 percent slopes49,082.173.96%
459Talkeetna-Chugach-Histic Cryaquepts association, 10 to 70 percent slopes42,631.563.44%
463Water, fresh40,590.233.28%
428Kashwitna-Kichatna complex, 0 to 3 percent slopes37,788.243.05%
462Typic Cryaquent and Typic Cryaquept soils, 0 to 2 percent slopes35,605.092.87%
413Deception-Estelle-Kichatna complex, 45 to 85 percent slopes32,321.772.61%
415Deception-Estelle-Kichatna complex, undulating and steep31,122.762.51%
456Talkeetna-Chugach-Deneka complex, 20 to 45 percent slopes30,980.942.5%
412Deception-Estelle-Kichatna complex, 20 to 45 percent slopes30,529.72.46%

Estimated Soil Components

Component acreage estimated from SSURGO component percentages
ComponentDrainage ClassHydrologic GroupEstimated Acres% of Mapped Area
DeceptionWell drainedB103,427.18.35%
TalkeetnaWell drainedB89,665.747.24%
KichatnaWell drainedB83,757.276.76%
CryorthentsSomewhat excessively drained, Well drainedB79,646.556.43%
KashwitnaWell drainedB79,249.376.4%
EstelleWell drainedB71,993.675.81%
Urban landUnspecifiedUnspecified71,295.15.76%
NakochnaWell drainedD62,525.515.05%
ChugachWell drainedB59,744.354.82%
WaterUnspecifiedUnspecified51,652.314.17%
Rock outcropUnspecifiedUnspecified51,197.84.13%
Andic HumicryodsWell drainedB42,780.93.45%
Histic CryaqueptsPoorly drainedD41,204.613.33%
HurdygurdyWell drainedB39,361.783.18%
DoroshinVery poorly drainedD38,161.313.08%
Component acreage is estimated from SSURGO map-unit component percentages. Component values are not independently mapped polygon boundaries.

Drainage Class Distribution

Well drained55.79%
690,958.81 acres
Unknown / Unmapped16.35%
202,470.79 acres
Very poorly drained11.95%
147,956.19 acres
Somewhat excessively drained6.92%
85,706.55 acres
Poorly drained5.16%
63,941.37 acres
Somewhat poorly drained2.59%
32,027.22 acres
Excessively drained0.77%
9,521.71 acres
Moderately well drained0.48%
5,967.43 acres

Hydrologic Soil Group Distribution

Group B55.66%
689,347.66 acres
Group D22.16%
274,423.07 acres
Group Unknown / Unmapped16.35%
202,470.79 acres
Group C5.07%
62,786.84 acres
Group A0.77%
9,521.71 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: 21.23%
Nearly Level (0-2%)21.19%
262,417.22 acres
Gently Sloping (2-8%)15.18%
188,041.81 acres
Moderately Sloping (8-15%)20.15%
249,537.76 acres
Steep (15-30%)7.5%
92,880.21 acres
Very Steep (>30%)35.98%
445,673.08 acres
Unspecified Slope0%
0 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).