HomeMy WebLinkAbout20093223.tiff • •
• SOIL REPORT-PIERCE NORTH GRAVEL PIT
Soil Description
Soils at the Pierce North site include gravelly alluviums(haplaquolls-fluvaquents)associated with
the channel of Lone Tree Creek.
The site contains Altvan fine sandy loams (unit 1). These soils are very well drained with
moderate wind and water erosion potential. The Altvan soils are suitable for non-irrigated
agricultural,typically winter wheat. Altvan soils in the area are used for rangeland pasture where
livestock are managed to prevent overgrazing.
The site also contains Bankard loamy fine sands (unit 12). Bankard loamy fine sands are
excessively drained, typically are found in floodplains. Wind erosion potential is high. The
Bankard soils are suitable for non-irrigated rangeland pasture where livestock are managed to
prevent overgrazing.
The 1981 soil survey identifies the areas of Altvan fine sandy loams as good for roadfill material
but too sandy for expectation of gravel deposits. The 1981 soil survey identifies the areas of
Bankard similarly although Weld County's experience at the adjacent Pierce pit in Section 7,
T8N, R65 W, is that sufficient larger gravel deposits do exist in the subsurface to provide suitable
• road base material.
Top soil at the Pierce North site is sparse and very thin,typically less than 6 inches thick.
Soils at the Pierce North site are described on Sheet 26 of 43 in the Soil Survey of Weld County,
Colorado—Northern Part published in 1981 by the Soil Conservation Service.
•
M:\DAVE B\Pierce North\Weld USR permit\SOIL REPORT.doc 2009-3223
• •
•
soil survey of
Weld County, Colorado
Northern Part
•
United States Department of Agriculture
Soil Conservation Service and Forest Service
in cooperation with
Colorado Agricultural Experiment Station
•
• •
• soil survey of
Weld County, Colorado
Northern Part
By James A. Crabb, Soil Conservation Service
Fieldwork by James A. Crabb, Peter L. Smith, and Dwight E. Curtiss,
Soil Conservation Service
United States Department of Agriculture, Soil Conservation Service
and Forest Service, in cooperation with Colorado Agricultural
Experiment Station
WELD COUNTY, NORTHERN PART, is in the alluvium, wind-modified alluvium, and exposed wean
• northeastern part of Colorado. It is north of Denver and bedrock, which borders the escarpments to the nortl
east of the Rocky Mountains. The total area is 1,429,520 The most easily observable physiographic area is
acres, or about 2,233 square miles. Greeley, the county escarpments that extend across the survey area fror
seat, is in the southern part of the county. west to east. "Chalk Bluffs" and "Pawnee Buttes" a
Most of the acreage in the survey area is used as this area. The escarpments are rolling to steep, and
rangeland and nonirrigated cropland. A small acreage is consist of rock outcroppings of siltstone that commc
used as irrigated cropland. have a cap of sandstone. Deposits of material derivr
Descriptions, names, and delineations of soils in this from siltstone, sandstone, and some shale are direr
soil survey do not fully agree with those on soil maps for below the escarpments. The escarpments are used
adjacent counties. Differences are the result of better mainly for cattle grazing and wildlife habitat.
knowledge of soils, modifications in series concepts, To the north and at a higher elevation than the
intensity of mapping, or the extent of soils within the escarpments is a gently undulating to rolling high plc
survey. The soils on this plain formed in alluvium and residu
derived from sandstone. The high plain has agriculk.
general nature of the survey area value.
The survey area is drained by numerous intermitte
This section discusses the physiography, drainage, creeks. Some of the major creeks in the western pa
and relief and the climate in the survey area. It also the survey area are Spring, Lone Tree, Owl, and Crc
discusses the Pawnee National Grassland. Creeks. They flow in a southerly direction through V-
survey area and join the South Platte River outside I
physiography, drainage, and relief area.
The major drainageways in the eastern part of the
The survey area is in the northern part of the Colorado area are Sidney Draw and Cedar and Pawnee Creel
Piedmont. It is in three distinct physiographic areas. A Sidney Draw flows in a northeasterly direction throui
knowledge of the location and nature of these areas the survey area and joins Lodgepole Creek in NebrE
helps in understanding the soils and agriculture in the Cedar and Pawnee Creeks drain to the east and joir
survey area. South Platte River in Logan County.
The largest part of the survey area is on a gently Elevation in the survey area ranges from
undulating to rolling plain. This part has great agricultural approximately 6,350 feet at the extreme northweste
• value. The soils on the plain formed mainly in alluvium. corner to 4,300 feet where Pawnee Creek flows fror
Also on the plain are some areas of reworked old area to the east.
i
en
/ rR.
• • +I
a
a.
N LO
mCO
m
m
to
n
n T
s.
c-I v l0
CO
a a ,
m
d P N �. J\
a m
n
LS 2M I-
.n
LO
� ^ N
m � m
eyK
a"
In
• II
d � —
a
in a
•
m C
J
d
an d a
Hello