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CANADA
DEPARTMENT OF ENERGY, MINES AND RESOURCES
GEOLOGICAL SURVEY OF CANADA
TOPICAL REPORT NO. 122
YUKON RIVER DRAINAGE BASIN DAM SITE INVESTIGATION
SITE No. 33
No. ___ 2. __
UPPER LAPIE CANYON DAM SITE (MAP AND NOTES)
E. B . OWEN
OTTAWA
1967
NOT TO BE QUOTED AS A PUBLICATION
FOR DEPARTMENTAL USE
CANADA
DEPARTMENT OF ENERGY, MINES AND RESOURCES
GEOLOGICAL SUR VEY OF CANADA
TOPICAL REPORT No. 122
YUKON RIVER DRAINAGE BASIN
DAM SITE INVESTIGATION
Site No. 33
UPPER LAPIE CANYON DAM SITE
(Map and Notes)
by
E. B. Owen
OTTAWA
1967
Upper Lapie Canyon Dam Site
General Description
The examination of Upper Lapie Canyon dam site was part of an inves -
tigation by the Water Resources Branch, Department of Energy, Mines and
Resources of the hydroelectric power potential in the Yukon Rive r drainage
basin. Uppe r Lapie Canyon dam site is situated on Lapie River in Yukon
Territory about 9 and a h alf miles upstream from the junction of Lapie and
Pelly Rivers. An alternate site (Lower Lapie Canyon), which is described in
Topical Report No. 115 , is located about 5 and a half miles downstream. Uppe r
Lapie Canyon dam site is included on National Topographic Series sheet No. lOSF
(Quiet Lake) , scale 1:250, OOO and on Royal Canadian Air Force aerial photograph
Al223 8-183. The geology is described on Geological Survey of Canada map
1 No. 7-1960 •
The pur pose of this investigation was to obtain some knowledge of
geological cond itions at Upper Lapie Canyon which would assist design enginee r s
in determinin g the feasibility of const r ucting a dam at .the canyon to provide
storage for larger dams on Pelly River. From the viewpoi nt of the geology
Upper Lapie Canyon is not a satisfactory site for a dam. Bedrock throughout
the. canyon has been gr eatly disturbed and considerable remedial work will be
necessary to rende r it suitable as abutment and foundation material. Other
1 Wheeler, J.O., Green, L .-H . and Roddick, J.A.·: Geology, Quiet Lake, Yukon Territory, Geol. Surv. Can. , Map 7-1960, 1960.
- 2 -
adverse features are the relatively small flow of water in Lapie River and the
limited amount of storage available in the narrow valley of Lapie River upstream
from the canyon. Redeeming features of the dam site are that it is readily
accessible from Canal Road and the availability of most types of construction
materials. Samples of the frozen soil were obtained using BX casing and a
10 pound sledge ,hammer.
Descri
pti
on
of
Fro
zen
So
il f
or
the f
oll
ow
ing
Gra
in S
ize A
naly
ses
Cu
rves
Pit
S
am
ple
D
ep
th
Descri
pti
on
of
Gro
up
>!<
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istu
re
Vis
ible
L
og
of
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o.
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cati
on
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o.
(in
in
ch
es)
M
ate
rial
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37
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7
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31
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Desc
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tio
n o
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ote
nti
al
Imp
er
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us
Mate
rial
for
the f
oll
ow
ing
Gra
in S
ize A
naly
sis
Cu
rve
Sam
ple
F
ield
Descri
pti
on
Group
~:<
Fie
ld D
escrip
tio
n
Th
ick
ness
A
real
Ex
ten
t
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mb
er
Lo
cati
on
o
f M
ate
ria
l _S
ym
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l o
f O
ve
rbu
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osi
t (E
stim
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ark
s
Blu
ff a
lon
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eft
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e
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l: c
lay
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nd
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6
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feet
of
30
feet
No
t la
rge b
ut
L.L
. -
25
. 0
of
Lap
ie R
iver;
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0
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se,
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wn
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ars
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.L.
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feet
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e
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nit
e t
o
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ch
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si
te
riv
er;
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in
ch
es
nu
mero
us
bla
ck
b
en
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gro
un
d
ch
ert
peb
ble
s fr
om
su
rface
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in
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29 I
LOCATION OF PROPOSED DAM SITES YUKON RIVER DRAINAGE BASIN
Scale: 1 inch = 20 miles
Site No. Name River
27 Hoole Canyon Pelly 28 Ross Canyon Ross 29 Prevost Canyon Ross
30 Upper Lapie Canyon La pie
38 Lower Lapie Canyon La pie
63°
61°
