The Benton democrat. [volume] (Corvallis, Benton County, Or.) 1871-18??, 1873-06-21
Canal and basin south of guard d Ii
lock, from 80 to 250ft. wide ;. 1,077 #.

lock, from so to 25oft. wide. 1,o77 #.
Total. -. 5000 #.
The four lift locks are what are call
ed combined, locks. the lower gate Of
one serving as the upper gate of the
lock next below. The walls ARE 19
feet in height above the locks floors,
5 feet wide on the top. with a batter Of
3. inches to- the foot founded in all
cases on solid rock, through which the
locks are cut. 2y5at ;5s.sei' ;
The guard lock wall Is 16 feet high
above the bed of the lock, with the
same general dimensions as the lift
locks. = .sEaa AZ
The first and second locks (north
are cut wholly in the solid rock, and
have. as their sides the natural rock,
with tenders bolted to it, except around
and below the gates, where masonry is
set in., for the hollow quoins and sup
ports for the gates. nf,a .se4E1 Il s3i5 d,
ma The third, lock is also cut.ins the SOL
id rock, but the walls rise above the
surface, and tenders, with backing of
three-in timber, are bolted and tied
into the rock. zsl-s1ssz.a
The fourth lock is almost entirely
above the rock, and has walls Of ma
sonry ON both Sides. The guard lock
is also of masonry on one side, with
the natural rock on the other, and fen
ders- bolted to it, the bearing for the
gates being masonry. Both above and
below the guard lock the cliff serves
for one side of the canal, and the tim
ber on the other side is founded on the
bed rock, except about 700 feet north
of the guard lock, which is built on
stone wall s feet wide on the top with
a batter of 3 inches, and from 8 to Is
feet Deep. reaching the bed rock below
The gates are constructed substantially,
after the plan of those of The Monon-
gahela locks being swung by suspen-
sion rods passing over, iron brackets on
the walls, and tied into the masonry.
They do not rest on rollers or tram
ways beneath, and are easily worked
by one man. In each gate are eight
wickets, each 4 by 2 feet, besides two
culverts leading under the sills to carry
off the mud and gravel, which might
otherwise clog the. gates. q q
The stone of the masonry is a fine
ground basaltic sand stone, exceedingly
hard and durable. The stone for the
hollow quoins are of the same charac-
ter of rock, but of somewhat different
texture, being obtained from the quar-
ry of Mr.. Baker. on the Clackamas
river 1888 Asfy
The masonry is laid in hydraulic ce-
ment, with no intermixture of lime.
Above the guard lock, the wall on
the east side is of lumber, the bents 5
feet apart, and each bent bolted to the
rock by three iron rods extending the
full length of the braces. The whole
timber wall, above and below the guard
lock is filled with stone. ~ g7
The maximum depth Of water is 2.
feet, and when the depth in the canal
above the guard lock is less than this
the guard lock gates are left open, but
for greater depths boats must lock
through. l!.tl2 ,5e7a.
Boats can now pass through with
depth Of 15 feet7of water on the upper
guard lock gates; and tits designed to
add an additional rail; so that they can
be passed through with 173 feet Of wa
ter. When the water is higher than
this the river cannot be safely navigat-
ed, and such foods rarely occur and
last only for a few days in the year.
The water power is almost unlimited
in quantity. 6 Esbaoa laes
The lowest depth of water above the
guard is A feet 6 inches, and only at
extreme low water. The fall from low
water above to low water below is Al
feet, The water may. be taken from
the basin above the guard lock, or TAX
en- from the canal below the guard
lock. In the latter case a current
would be provided through the canal,
depending on the amount of water
taken out, with a depth of 4 feet. and a
depth of miles per hour; the volume
of f-water would be 2S.16O cubic feet
per minute, which, with head of 80.
feet to. allow for back water below in
rises Of the river, would amount to L.
500 horse power theoretical, or say L.
200 horse power actual, if, taken from
the canal at the lowest stage OF water.
h This could be doubled or trebled by
taking the water from above the guard
lock. Between the guard lock and the
entrance to the locks below the falls,
there are over 2,o0e feet of shore line
with a width back of from 100 to 800
feet, all well adapted for manufacturing
purposes. The water can also be TAX
en- from the canal along the west side
Of the locks to the shore line belowthe.
locks. .1Ikr3 .Es48
A, dry dock may be built at a little
cost on the west side OF the fourth or
upper lock, between the lock wall and
bluff, using the lock wall and the bluff
as walls. The depth Of cutting would
he about 6feet, and taking the length;
at 80 feet and the width at SO feet,
excavation would be about $500 yards
The works, ] consider ito. be in ex-
.cellent condition.3a All Of the founda-l
items, Of both masonry and wood work,
are on solid rock, and the lock hoors.
and canal beds are also Of rock. EY.
cry portion of the work is of the bestl
material and carefully built, and viii
require but little repair,