FLOOD08209

• County: Adams
• County: Arapahoe
• County: Douglas, Jefferson
• Community: Denver Metroploitan Area
• Stream Name: South Platte River, Chatfield Dam to Baseline Road
• Basin: South Platte
• Title: Major Drainageway Planning
• Date: 8/1/1984
• Prepared For: Denver Metropolitan Area
• Prepared By: Wright Water Engineers, Inc.
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

V II-6

SAND AND GRAVEL RESOURCES

There is
gravel.
ref erred

a variation in the engineering geologic classification of sand
To assist in understanding the classifications, the reader is
to Figure VII-3.

and

Size OIOlOGICAl INDUSTIIAL TYLII us Size
... CLASSifiCATION CLAISI'IC.'ION ,- SIIVI tNC... ...
IWIN'WOf'"' CAn.. SIIVI SIlIU
IOH - ~
-
"0 ~
- f- 2-52 - r-
O....vlL
': z
-
- M GI.vh
w w
~ .
'00 - ;-
:
.
.
- -c - --. - ~o 117- r "'699
c.., - -0157- f-
5
z
c I- -, - - -, -
. -009>- r- 236'
..
2'" '0 - --'0 - - 0 070- f-- 2.0
~lll
.-
-a f-ou _ --16 -
>v -004&- I- 1 161
',0 .. f-
w
M
.
a SAND f--:U - --,)0 - - 0 023- f- 0 >I'
v
050 JS
!
0 'ANO
- f--" - -. so -
. 0012- f- 0 '"
02S 60
w
!
- f--'OO - --'00- -OO~
0'25 ~ 0.1417
w 120
010 - Z r-
;;:
t -200- -
~ - 200- - 0 003- f- 0-074
"'25
00' -
liLT SILT

Figure VII-4 presents
alluvium samples and
The sampl es are from
River corridor. The

1 1/2 to 3 inches.

grain size distribution curves for eight Broadway
three Piney Creek alluvium samples by Turner (1974).
the Henderson to Brighton reach of the South Platte
samples range from fine sand up to gravel of about
Roughly 50 percent of the material is gravel.

Reserves
Cross sections were plotted by Turner (1974) and computations made of gravel
reserves for the Henderson-Brighton reach. The cross sections are shown in
Figure VII-2. Cross sections were about 4,500 feet apart as shown on Figure
VII -1.

Table Vll-l presents a summary of aggregate quantities in the South Platte
River valley.

TABLE Vll-l
SOUTH PLATTE RIVER VALLEY
AGGREGATE QUANTITIES
(After Turner)

Section
Baseline to AA'
AA-BB'
BB-CC'
CC-DD'
DD-EE'
EE-FF '
FF-GG'

Aggregate
Extractable Potential
48,000,000 cy
59,000,000 cy
60,000,000 cy
59,000,000 cy
65,000,000 cy
77 ,000,000 cy
62,OOO,ODD cy

Geological and industrial classification of sand
and gravel showing common sieve sizes in inches
and millimeters.

I n r -'- _ _ II _ -' ~ .L .. ,...,.... ""' \
\1''\1 LeY" neWill.., l:10j)

The river sections tabulated above represent 430,000,000 cubic yards of ex-
tractable aggregate over a distance of 5.9 miles. The average potentially

Figure VII-3