Official Series Description


Lab Data Summary

Aggregate lab data for the TRAILHEAD soil series. This aggregation is based on all pedons with a current taxon name of TRAILHEAD, and applied along 1-cm thick depth slices. Solid lines are the slice-wise median, bounded on either side by the interval defined by the slice-wise 5th and 95th percentiles. The median is the value that splits the data in half. Five percent of the data are less than the 5th percentile, and five percent of the data are greater than the 95th percentile. Values along the right hand side y-axis describe the proportion of pedon data that contribute to aggregate values at this depth. For example, a value of "90%" at 25cm means that 90% of the pedons correlated to TRAILHEAD were used in the calculation. Source: KSSL snapshot . Methods used to assemble the KSSL snapshot used by SoilWeb / SDE

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Pedons used in the lab summary:

MLRALab IDPedon IDTaxonnameCINSSL / NASIS ReportsLink To SoilWeb GMap
4BUCD581201158-CA-12-011xTRAILHEAD3Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties40.9180298,-123.8600464
4BUCD601201460-CA-12-014xTRAILHEAD3Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties41.0752144,-124.0063782
4BUCD601201760-CA-12-017xTRAILHEAD4Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties41.2070007,-124.0549545
4BUCD601201860-CA-12-018xTRAILHEAD3Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties41.211586,-124.0351791
4BUCD611202161-CA-12-021xTRAILHEAD3Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties41.4562111,-123.9018021
4BUCD621202462-CA-12-024xTRAILHEAD3Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties41.2853241,-123.9310074
4B10N0675S10CA023004Trailhead6Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties41.2090988,-123.9959869

Water Balance

Monthly water balance estimated using a leaky-bucket style model for the TRAILHEAD soil series. Monthly precipitation (PPT) and potential evapotranspiration (PET) have been estimated from the 50th percentile of gridded values (PRISM 1981-2010) overlapping with the extent of SSURGO map units containing each series as a major component. Monthly PET values were estimated using the method of Thornthwaite (1948). These (and other) climatic parameters are calculated with each SSURGO refresh and provided by the fetchOSD function of the soilDB package. Representative water storage values (“AWC” in the figures) were derived from SSURGO by taking the 50th percentile of profile-total water storage (sum[awc_r * horizon thickness]) for each soil series. Note that this representation of “water storage” is based on the average ability of most plants to extract soil water between 15 bar (“permanent wilting point”) and 1/3 bar (“field capacity”) matric potential. Soil moisture state can be roughly interpreted as “dry” when storage is depleted, “moist” when storage is between 0mm and AWC, and “wet” when there is a surplus. Clearly there are a lot of assumptions baked into this kind of monthly water balance. This is still a work in progress.

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Sibling Summary

Siblings are those soil series that occur together in map units, in this case with the TRAILHEAD series. Sketches are arranged according to their subgroup-level taxonomic structure. Source: SSURGO snapshot , parsed OSD records and snapshot of SC database .

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Select annual climate data summaries for the TRAILHEAD series and siblings. Series are sorted according to hierarchical clustering of median values. Source: SSURGO map unit geometry and 1981-2010, 800m PRISM data .

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Geomorphic description summaries for the TRAILHEAD series and siblings. Series are sorted according to hierarchical clustering of proportions and relative hydrologic position within an idealized landform (e.g. top to bottom). Most soil series (SSURGO components) are associated with a hillslope position and one or more landform-specific positions: hills, mountain slopes, terraces, and/or flats. Proportions can be interpreted as an aggregate representation of geomorphic membership. The values printed to the left (number of component records) and right (Shannon entropy) of stacked bars can be used to judge the reliability of trends. Small Shannon entropy values suggest relatively consistent geomorphic association, while larger values suggest lack thereof. Source: SSURGO component records .

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There are insufficient data to create the 3D terrace figure.

There are insufficient data to create the 3D flats position figure.

Competing Series

Soil series competing with TRAILHEAD share the same family level classification in Soil Taxonomy. Source: parsed OSD records and snapshot of the SC database .

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Select annual climate data summaries for the TRAILHEAD series and competing. Series are sorted according to hierarchical clustering of median values. Source: SSURGO map unit geometry and 1981-2010, 800m PRISM data .

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Geomorphic description summaries for the TRAILHEAD series and competing. Series are sorted according to hierarchical clustering of proportions and relative hydrologic position within an idealized landform (e.g. top to bottom). Proportions can be interpreted as an aggregate representation of geomorphic membership. Most soil series (SSURGO components) are associated with a hillslope position and one or more landform-specific positions: hills, mountain slopes, terraces, and/or flats. The values printed to the left (number of component records) and right (Shannon entropy) of stacked bars can be used to judge the reliability of trends. Shannon entropy values close to 0 represent soil series with relatively consistent geomorphic association, while values close to 1 suggest lack thereof. Source: SSURGO component records .

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There are insufficient data to create the 3D hills figure.

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There are insufficient data to create the 3D terrace figure.

There are insufficient data to create the 3D flats position figure.

Soil series sharing subgroup-level classification with TRAILHEAD, arranged according to family differentiae. Hovering over a series name will print full classification and a small sketch from the OSD. Source: snapshot of SC database .

Block Diagrams

Click a link below to display the diagram. Note that these diagrams may be from multiple survey areas.

  1. CA-2012-04-20-13 | Redwood National and State Parks - 2008

    Block diagram 3. Generalized pattern of soil distribution and conceptualized geology in the Redwood Creek watershed viewed from the Hog Prairie area north towards Harry Weir Creek (Soil Survey of Redwood National and State Parks, California; 2008).

Map Units

Map units containing TRAILHEAD as a major component. Limited to 250 records.

Map Unit Name Symbol Map Unit Area (ac) Map Unit Key National Map Unit Symbol Soil Survey Area Publication Date Map Scale
Tectah-Coppercreek-Trailhead complex, 0 to 30 percent slopes558428424505942ll7gca60020171:24000
Trailhead, 15 to 30 percent slopes56097424505962ll7jca60020171:24000
Trailhead-Fortyfour complex, 30 to 50 percent slopes56237824505982ll7lca60020171:24000
Trailhead, 0 to 15 percent slopes5591862450595wklkca60020171:24000
Tectah-Coppercreek-Trailhead complex, 0 to 30 percent slopes55895718212682ll7gca60520131:24000
Trailhead, 15 to 30 percent slopes56049588212702ll7jca60520131:24000
Trailhead-Fortyfour complex, 30 to 50 percent slopes56228938212722ll7lca60520131:24000
Ladybird-Trailhead complex, 15 to 30 percent slopes5545918212642ll7bca60520131:24000
Trailhead, 0 to 15 percent slopes559566821269wklkca60520131:24000
Trailhead-Fortyfour complex, 30 to 50 percent slopes562450724008132ll7lca79620071:24000
Trailhead, 15 to 30 percent slopes560442524008112ll7jca79620071:24000
Tectah-Coppercreek-Trailhead complex, 0 to 30 percent slopes558138924008092ll7gca79620071:24000
Trailhead, 0 to 15 percent slopes5593532400810wklkca79620071:24000
Ladybird-Trailhead complex, 15 to 30 percent slopes55431324008052ll7bca79620071:24000

Map of Series Extent

Approximate geographic distribution of the TRAILHEAD soil series. To learn more about how this distribution was mapped, or to compare this soil series extent to others, use the Series Extent Explorer (SEE) application. Source: generalization of SSURGO geometry .