Soil Data Explorer - STEVENS

Official Series Description

Lab Data Summary

Aggregate lab data for the STEVENS soil series. This aggregation is based on all pedons with a current taxon name of STEVENS, 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 STEVENS were used in the calculation. Source: KSSL snapshot (updated 2020-03-18). Methods used to assemble the KSSL snapshot used by SoilWeb / SDE

Pedons used in the lab summary:

MLRA	Lab ID	Pedon ID	Taxonname	CI	NSSL / NASIS Reports	Link To SoilWeb GMap
43A	69C0034	S1969WA065001	Stevens	6	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	48.8047806,-118.0797833
43A	69C0035	S1969WA065002	Stevens	6	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	48.7867966,-118.0980682

Water Balance

Monthly water balance estimated using a leaky-bucket style model for the STEVENS 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.

Sibling Summary

Siblings are those soil series that occur together in map units, in this case with the STEVENS series. Sketches are arranged according to their subgroup-level taxonomic structure. Source: SSURGO snapshot (updated 2024-02-21), parsed OSD records (updated 2023-10-06) and snapshot of SC database (updated 2023-10-02).

Select annual climate data summaries for the STEVENS series and siblings. Series are sorted according to hierarchical clustering of median values. Source: SSURGO map unit geometry and 1981-2010, 800m PRISM data (updated 2023-10-09).

Geomorphic description summaries for the STEVENS 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 (updated 2023-10-04).

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

Competing Series

Soil series competing with STEVENS share the same family level classification in Soil Taxonomy. Source: parsed OSD records (updated 2023-10-06) and snapshot of the SC database (updated 2023-10-02).

Select annual climate data summaries for the STEVENS series and competing. Series are sorted according to hierarchical clustering of median values. Source: SSURGO map unit geometry and 1981-2010, 800m PRISM data (updated 2023-10-09).

Geomorphic description summaries for the STEVENS 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 (updated 2023-10-04).

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

Soil series sharing subgroup-level classification with STEVENS, 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 (updated 2023-10-02).

Block Diagrams

No block diagrams are available.

Map Units

Map units containing STEVENS 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
Stevens channery silt loam, 8 to 25 percent slopes	230	17746	158202	59m9	wa065	1978	1:24000
Stevens stony silt loam, 0 to 40 percent slopes	232	10539	158204	59mc	wa065	1978	1:24000
Stevens-Rock outcrop complex, 40 to 65 percent slopes	235	9034	158207	59mg	wa065	1978	1:24000
Rock outcrop-Stevens complex, 30 to 65 percent slopes	197	8294	158164	59l2	wa065	1978	1:24000
Stevens ashy silt loam, 8 to 15 percent slopes	229	6918	158200	2x1zq	wa065	1978	1:24000
Stevens stony silt loam, 40 to 65 percent slopes	233	6283	158205	59md	wa065	1978	1:24000
Stevens channery silt loam, 25 to 40 percent slopes	231	6277	158203	59mb	wa065	1978	1:24000
Stevens-Rock outcrop complex, 25 to 40 percent slopes	234	5969	158206	59mf	wa065	1978	1:24000
Stevens ashy silt loam, 0 to 8 percent slopes	228	971	158199	2x1zp	wa065	1978	1:24000
Stevens ashy silt loam, 8 to 15 percent slopes	StC	337	70181	2x1zq	wa619	1968	1:24000
Stevens silt loam, 15 to 25 percent slopes	StD	326	70182	2c0y	wa619	1968	1:24000
Stevens stony silt loam, 0 to 45 percent slopes	SvE	315	70183	2c0z	wa619	1968	1:24000
Stevens ashy silt loam, 8 to 15 percent slopes	460	3176	70612	2x1zq	wa648	1987	1:24000
Stevens silt loam, 15 to 30 percent slopes	461	1929	70613	2cgv	wa648	1987	1:24000
Stevens ashy silt loam, 0 to 8 percent slopes	459	1228	70610	2x1zp	wa648	1987	1:24000
Stevens gravelly silt loam, 30 to 65 percent slopes	462	335	70614	2cgw	wa648	1987	1:24000

Map of Series Extent

Approximate geographic distribution of the STEVENS 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 (updated 2023-10-04).