WSP00118

• File Number: 8449.921
• Description: Lower Platte Tri-County Project Water Demand & Power Studies
• State: NE
• Basin: South Platte
• Date: 1/1/1923
• Author: Univer. Of Nebraska
• Title: Report of Certain Investigations on the Central Nebraska Supplemental Irrigation Project
• Water Supply Pro - Doc Type: Publication

,il

~

DEPARTMENT OF PUBLIC WORKS

221

is a red formation called red' loess, which is not .essentially different
from the buff or drab variety.
~. .
Soil . Types~. Four soii series comprise the irrigable iahd of fhe
area. These are ilesignated by the Bureau of . Soils as' Grundy,
Boldrege, Colby, and Wabash... (6): .'

qruru:ly. . The Grundy series is characteri~ed by a brownish ~lack
surface soil 10 to 12 inches deep,. underlain by 6 to .10 in~he~ of
I'lightly lighter brown subsurface a little heavier in ~xture than the
I'urface. At.a depth of 16 to 22 inches this changes quite abruptly to
a heavy textured., tenacious, brownish black to brownish drab. subsoil.
This layer is usually from 9 to 12. inches thick and passes again qUite
abruptly into a drab colored, floury, friable .parent soilmaterialwhi~h
extends to considerable depth without change. The topography is flat
to slightly rolling and the drainage. is usually. well establi'shed. ..... .

The only Grundy type in this area is the Grundy loam. . It
occupie3 the extreme eastern end of the proposed irrigation area, not
extending any further west than Juniata and Prosser. The mechan-
iCal analysis of a representativE' sample is shown in Table 6,-Hansen

TABLE NO. 6.-1"'~hanleal Analysl,.. of the Soil at. Fhre ~epre8entatt~e
Points Over the Proposed Areas.
. \ .
Separate Hansen Hartwell Norman Minden
Sand ....._.. 46.5 67.3 57.9 50.5
Sllt .._......_ 35.4 17.9 25.1 28.3
Clay m.m_ 18.1 14.8 17.0 21.1

,

l

!

Depth
Feet
1

I
f!
:

Bertrand
44.2
37.1
18.2

2

Sand! .h__m 40.0 71.5 46.4 38.5 41.3
Slit .--....... 38.7 13.6 32.2 30.9 32.6
Clay 21.3 14.9 21.4' 30.6 26.1
Sand '35.2 76.6 . 34.7 29.0 43.0
Silt ..__n___. 36.8 11.5 ' 33.4 33.1 32.9
Clay ....--.. 28.0 11.9 31.9, 37.8 U.1
Sand ...._n. 38.0 71.6 40.6 37.'9 42.6
Silt -=:. 38.0 13.0 38.6 39.3 38.1
Clay 24.0 15.4 20.7 22.8 19.3
Sand "nO_n 43.4 61.2 42.1 40.8 46.1
Sllt .......... 36.3 18.2 40.8 40.2 38.0
Clay 20.3 20.6 17.1 . '19.0 16.S
Sand 47.4 45.8 43.3 41.5 49.0
Silt ..---.---. 37.0 17.4 40.9 41.5 37.2
Clay 15.6 36.8 15.8 17.0 13.8

3

4

5

6

area. The surface foot contains 18.1 per dent of clay. This increase~
to a maximum of 28.0 per cent in the third foot and decreases agaIn
to 15.5 per cent in the sixth foot.

Holdrege. The Boldrege series is characterized by a dark
brown to black surface soil 12 to 20 inches deep passing into a