LOCATION FISHPOT MO

Established Series
Rev. KEB-RLT-TJE
05/2020

FISHPOT SERIES

The Fishpot series consists of very deep, somewhat poorly drained soils formed in 60 to 122 centimeters (24 to 48 inches) of human-transported material over buried alluvial or terrace soils. These soils are in river valleys on anthropogenic landforms in and near urbanized areas. Slope ranges from 0 to 5 percent. Mean annual temperature is 12.2 degrees C (54 degrees F), and mean annual precipitation is 1,050 millimeters (41 inches).

TAXONOMIC CLASS: Fine-silty, spolic, mixed, superactive, nonacid, mesic Anthropic Udorthents

TYPICAL PEDON: Fishpot silt loam, on a 1 percent slope in a park under grass at an elevation of 160 meters (525 feet) above mean sea level. (Colors are for moist soil unless otherwise stated.)

^Au1--0 to 10 centimeters (0 to 4 inches); very dark grayish brown (10YR 3/2) silt loam, grayish brown (10YR 5/2) dry; weak fine subangular blocky structure; friable; 2 percent chert rock fragments; 2 percent gravel-sized glass fragments; moderately acid; clear wavy boundary.

^Au2--10 to 30 centimeters (4 to 12 inches); variegated very dark grayish brown (10YR 3/2) and dark yellowish brown (10YR 4/4) silt loam, pale brown (10YR 6/3) dry; weak fine and medium subangular blocky structure; friable; 1 percent gravel-sized glass fragments; moderately acid; abrupt wavy boundary. [Combined thickness of the ^Au horizon is 25 to 30 centimeters (10 to 12 inches).]

^C--30 to 48 centimeters (12 to 19 inches); 60 percent brown (7.5YR 4/4) silty clay loam and 40 percent very dark grayish brown (10YR 3/2) silt loam; massive; firm; moderately acid; abrupt wavy boundary. [0 to 20 centimeters (0 to 8 inches) thick]

^Cu--48 to 67 centimeters (19 to 26 inches); brown (7.5YR 4/4) silt loam; massive; firm; common pockets of brown (7.5YR 4/4) silty clay ; 2 percent gravel-sized glass fragments and 5 percent gravel-sized brick fragments; moderately acid; abrupt wavy boundary. [35 to 97 centimeters (14 to 38 inches) thick]

2Aub--67 to 87 centimeters (26 to 34 inches); very dark gray (10YR 3/1) silt loam; weak fine subangular blocky structure; friable; few fine faint black (10YR 2/1) iron-manganese nodules; 5 percent gravel-sized brick fragments; moderately acid; clear wavy boundary. [0 to 25 centimeters (0 to 10 inches) thick]

2ACb--87 to 101 centimeters (34 to 40 inches); variegated very dark grayish brown (10YR 3/2) and dark grayish brown (10YR 4/2) silt loam; weak fine subangular blocky structure; friable; few fine faint black (10YR 2/1) iron-manganese nodules; moderately acid; clear wavy boundary. [0 to 45 centimeters (0 to 18 inches) thick]

2Cg1--101 to 150 centimeters (40 to 59 inches); dark grayish brown (10YR 4/2) gravelly silt loam; massive; firm; few fine distinct black (10YR 2/1) iron-manganese nodules; common fine faint gray (10YR 5/1) iron depletions; common fine prominent strong brown (7.5YR 4/6) masses of oxidized iron; 15 percent chert rock fragments; moderately acid; abrupt wavy boundary.

2Cg2--150 to 186 centimeters (59 to 73 inches); gray (10YR 5/1) very gravelly clay loam; massive; firm; many fine faint light gray (10YR 7/1) iron depletions; common fine prominent strong brown (7.5YR 4/6) masses of oxidized iron; 40 percent chert rock fragments; moderately acid; abrupt wavy boundary.

2Cg3--186 to 200 centimeters (73 to 79 inches); grayish brown (10YR 5/2) clay loam; massive; very firm; common fine and medium distinct black (10YR 2/1) iron-manganese nodules; many fine faint gray (10YR 6/1) iron depletions; many medium prominent strong brown (7.5YR 4/6) masses of oxidized iron; 10 percent chert rock fragments; moderately acid.

TYPE LOCATION: St. Louis County, Missouri; in the city of Webster Groves; in Larson Park along West Kirkham Avenue near Shady Grove Creek; USGS Webster Groves topographic quadrangle; lat. 39 degrees 35 minutes 36.4416 seconds N. and long. 90 degrees 22 minutes and 13.6884 seconds W., WGS84.

RANGE IN CHARACTERISTICS:
Depth to bedrock: greater than 200 centimeters (79 inches)
Thickness of the human-transported material: 60 to 122 centimeters (24 to 48 inches)
Human artifacts: asphalt, brick, ceramic, cinders, concrete, glass, metal, and wood; in some places these artifacts are mixed in the upper horizon of the buried soil
Series control section: very strongly acid to neutral throughout; moist bulk density is less than 1.6 g/cc in all layers
Particle-size control section: averages 18 to 35 percent clay
Other features: some subhorizons of the ^Cu or ^C horizon have blocky or platy structure that is believed to be the result of how the soil material was put in place by mechanical means

^Au or ^A horizon:
Hue: 7.5YR or 10YR
Value: 2 to 4
Chroma: 2 to 4
Texture: silt loam or silty clay loam
Rock fragment content: 0 to 10 percent chert gravel
Human artifact content: 1 to 14 percent

Some pedons have an ^AC, ^ACu, ^A/C, ^Bw, or ^Bwu horizon.

^Cu or ^C horizon:
Hue: 7.5YR to 2.5Y
Value: 2 to 5
Chroma: 2 to 4
Texture: silt loam or silty clay loam
Rock fragment content: 0 to 10 percent chert gravel
Human artifact content: 0 to 14 percent

2Ab, 2Aub, or 2ACb horizon:
Hue: 10YR
Value: 3 to 5
Chroma: 1 to 3
Texture: silt loam
Rock fragment content: 0 to 10 percent chert gravel
Human artifact content: 0 to 5 percent

2Cg or 2C horizon, or 2Bgb or 2Bwb horizon, where present:
Hue: 7.5YR to 2.5Y
Value: 4 to 7
Chroma: 1 to 4
Texture: silt loam, silty clay loam, or clay loam, or their gravelly and very gravelly analogues
Rock fragment content: 0 to 40 percent chert gravel
Human artifact content: 0 percent, but ranges to 5 percent in subhorizons that are directly beneath the human-transported material (where the 2Ab, 2Aub, or 2ACb horizon is absent)

COMPETING SERIES: There are no other series in this family. Harvester and Rapatee soils are in closely related families. Harvester soils do not have human artifacts or rock fragments within the series control section. Rapatee soils have moist bulk density of 1.6 g/cc or greater in each layer.

GEOGRAPHIC SETTING: Fishpot soils are in river valleys on anthropogenic landforms in and near urbanized areas where human-transported materials have been placed over buried alluvial and terrace soils. The human-transported material contains human artifacts such as asphalt, brick, ceramic, cinders, glass, metal, and wood. Thickness of the human-transported material ranges from 60 to 122 centimeters, increasing the elevation of the landform. Slope ranges from 0 to 5 percent. Mean annual temperature ranges from 11.1 to 13.9 degrees C (52 to 57 degrees F). Mean annual precipitation ranges from 940 to 1,194 millimeters (37 to 47 inches). Frost-free period is 184 to 228 days. Elevation is 110 to 200 meters (360 to 655 feet) above mean sea level.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Clarksville, Gasconade, Goss, Harvester, Menfro, and Winfield soils on higher upland positions. Clarksville and Goss soils have skeletal control sections. Gasconade soils are lithic. The moderately well drained Harvester soils are on higher positions. Menfro and Winfield soils lack disturbed horizons. Associated soils on lower flood plain positions are the Blake, Booker, and Nevin soils. Blake soils are calcareous. Booker soils are in a very fine textural family. Nevin soils have chroma of 2 or less throughout the control section. Freeburg soils are also associated with the Fishpot soils. Freeburg soils on higher positions on flood-plain steps.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Somewhat poorly drained. Depth to the top of an apparent seasonal high water table ranges from 55 to 117 cm (22 to 46 inches) at some time between November and May in normal years. Saturated hydraulic conductivity is moderately high (1.40 to 14.00 micrometers per second). Permeability is moderately slow or moderate. In some areas, Fishpot soils are subject to rare to frequent flooding for very brief to long periods. In other areas, the Fishpot soils are not subject to flooding due to a raise in elevation from the deposits of human-transported material.

USE AND VEGETATION: Fishpot soils are used for residential, commercial and industrial buildings, adjacent grounds, parks and playgrounds, roads and streets. Present vegetation is lawn grasses, ornamental shrubs, and shade trees. Native vegetation is mixed hardwoods.

DISTRIBUTION AND EXTENT: MLRA 115; urban areas in Missouri, and possibly other urban areas in adjacent states. The series is of moderate extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Indianapolis, Indiana

SERIES ESTABLISHED: St. Louis County, Missouri, 1979.

REMARKS: Diagnostic features and horizons recognized in this pedon are:
Anthropic epipedon: from the surface to a depth of 30 centimeters (12 inches) (^Au1 and ^Au2 horizons).
Depth to buried A horizon formed in alluvium: 67 centimeters (26 inches) (top of 2Aub horizon).
Depth to aquic conditions: redox features in all buried horizons below a depth of 67 centimeters (26 inches).

Fishpot soils occur on stream terraces and flood plains that were altered as a result of urbanization. The surface elevation was raised by deposits of human-transported material to reduce the risk of overflow. The amount of filling, cutting, and alteration of existing soil is variable from place to place.

ADDITIONAL DATA: Characterization data is available for the typical pedon (S2020MO189001) and for supporting pedons from the University of Missouri Soil Health Assessment Center, Columbia, MO.

National Cooperative Soil Survey
U.S.A.