FLOOD11466

• County: Yuma
• Community: Yuma County
• Basin: South Platte
• Title: Colorado Ground Water - Basic Data Report No. 2
• Date: 1/1/1960
• Floodplain - Doc Type: Floodplain Report/Masterplan

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System Series Subdiviaion Thickness p'hysical Character Water Supply
(feet) "
Yields adequate quantities of water' for -.
Alluvium 0-7 St Unconsoli.dated gravel. sand. ailt.
and cllLY, both intermixed and stock and domestic supplies. Alluv iurn
as al tE!rnating layers in the valley of the North Fork of the
Republican River yields a small ~antity
for irrigation. Alluvium in the
Arikaree River valley yields moderate
quantities for irrigation. Alluvium
in the valley of the South Fork o~ the
Republican River yields moderate to large
Recent quantities for irrigation ,.
and -.
Pleistocene Dune sand 0-1001 Tan unconsolidated very fine Generally lies above the water table and,
to coa.rse quartz sand, hence, yields no water to wells. May
>< wind-dE~posited yield amounts adequate for stock or
" domestic purposes where saturated. The
~
c dunes are important catchment areas
" for recharge from precipitation, ~wing
~ to the relatively high permeabili~y
... of the sand
II Unconformity
~
0 peorian loess O-120t xe.L.LOW'1.BJ\-grey S1.~,- GUu. ~~a.r LJ.es above tne water table ana, hence,
containing scattered sand yields no water to wells. Most
grains and calcareous precipitation runs off. Many
concre1:ions; wiJld-deposited intermittent lakes form on the su-tface
Unconformity
Pleistocene -sappa(7} formation O-lOt Light-gray fossiliferous sand and Genera.Lly .L1..es aoove tne water tabl.e -
silty Dlarl overlain by thin and, hence, yields no water to
soil zcme wells
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Grand Island(?) formation O-JOt Loosely c:onsolidated calcareous Do
reddish-brown to light-gray ,
sand and gravel, stream-deposited
Unconformi ty
Pliocene Ogallala formation 0-460 Gravel, l!land, silt, and clay con- The principal aquifer in the county.
>< tainin9 beds of limy sandstone, Yields adequate quantities of wat~r
"
II opalinE! quartzite, and volcanic for stock and domestic supplies
... a.sh: "~llqal" limestone at top; throughout most of area of ita ,
... s tream~.depos i ted occurrence. In many places yields
" I moderate to large quantities for
~
Eo< Unconformity irrigation. ,
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Upper pierre shale 1,300-2, soo Gray to lllack marine shale con- Not known to yield water to wells in
G Cretac~ous taininc:;r gypsum, bentonite, and the area
6
~ calcarE!Ous concretionsr weathered
u
~ zone of yellow clay usually
...
.
" present: at top
<J
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w

i,.n Yuma Countv.

Table l.--Generalized section of the qec.lOQic foruaationa

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