Soil Data Explorer - BRESSA

Official Series Description

Lab Data Summary

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

There are insufficient data to create the lab data summary figure.

Water Balance

Monthly water balance estimated using a leaky-bucket style model for the BRESSA 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 BRESSA 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 BRESSA 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 BRESSA 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 terrace figure.

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

Competing Series

Soil series competing with BRESSA 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 BRESSA 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 BRESSA 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 mountains figure.

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 BRESSA, 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 BRESSA 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
Millsholm-Bressa loams, 30 to 50 percent slopes	177	15416	459580	hf75	ca033	1985	1:24000
Millsholm-Bressa-Hopland association, 30 to 50 percent slopes	178	12905	459581	hf76	ca033	1985	1:24000
Maymen-Millsholm-Bressa complex, 30 to 50 percent slopes	175	12738	459578	hf73	ca033	1985	1:24000
Bressa-Millsholm loams, 15 to 30 percent slopes	120	6523	459523	hf5b	ca033	1985	1:24000
Pomo-Bressa loams, 15 to 50 percent slopes	198	1485	459601	hf7v	ca033	1985	1:24000
Bressa-Millsholm loams, 8 to 15 percent slopes	119	1156	459522	hf59	ca033	1985	1:24000
Bressa-Dibble complex, 30 to 50 percent slopes	114n	5	1606887	1qy32	ca033	1985	1:24000
Bressa variant-McMullin variant complex, 30 to 50 percent slopes	109	1410	459401	hf1d	ca041	1979	1:24000
Bressa-Dibble complex, 30 to 50 percent slopes	114	60370	458938	hdkg	ca055	1974	1:24000
Bressa-Dibble complex, 50 to 75 percent slopes	115	22030	458939	hdkh	ca055	1974	1:24000
Bressa-Dibble complex, 15 to 30 percent slopes	113	7875	458937	hdkf	ca055	1974	1:24000
Bressa-Dibble complex, 5 to 15 percent slopes	112	2810	458936	hdkd	ca055	1974	1:24000
Maymen-Millsholm-Bressa complex, 30 to 50 percent slopes	175l	61	813831	w9vm	ca055	1974	1:24000
Bressa-Dibble complex, 30 to 50 percent slopes	114n	359	456144	h9nb	ca095	1969	1:24000
Bressa variant-McMullin variant complex, 30 to 50 percent slopes	109m		1607438	1qynv	ca097	1968	1:20000
Bressa-Dibble complex, 30 to 50 percent slopes	114n		1607430	1qynl	ca097	1968	1:20000
Bressa-Dibble complex, 30 to 50 percent slopes	114n	667	765505	tpkq	ca113	1968	1:20000
Bressa-Dibble complex, 50 to 75 percent slopes	115n	142	765506	tpkr	ca113	1968	1:20000

Map of Series Extent

Approximate geographic distribution of the BRESSA 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).