Sacramento daily record-union. [volume] (Sacramento [Calif.]) 1875-1891, 1880-02-04
REMARKS ON THE TABLEs-CHANNEL OMEN
SIONS AND GRADES
SACRAMENTO RIVER.


The data from which this table is prepared is
complete and reliable for the third fourth, kfth
sixth, seventh and eighth divisions, and about two
thirds OF the second.
For the remainder of the second (aboye Butte
City, and fol the first division the data is good but
not being so much in detail small errors in tie
averages may exist.
A part OF the sixth and all of the seventh, eighth
and ninth divisions within the range of tidal IN
1uence; and the water elevations given within
these divisions are those for the low tide planes dur
ing both the low water and flood stages OF the river
1t should be remarked here that what is said else
where this report concerning the break in the
flood-line at the head OF Grand Island may not be
so apparent from this table for the reason that
the grade above as here represented is the average
throughout the sixth division, while that taken in
the discussion referred to only extends to Freeport
from the head OF the island. Haycock shoa and
the action OF the American river make the grade in
the hood-plane sleeper above Freeport; hence the
effect OF the Grand Island defect in regimen is taken
extending only to Freeport in the extreme food
stage
Furthermore the half tide slopes are considered
in the division, whereas the slopes here given
for extreme low tides only, which at times of high
water are felt small part of the way up Steamboat
slough and Old river channels
To obtain fair idea Of the break in the profile at
the head Of Grand Island, look at the minimum
grade for FIVE miles Of channel in the sixth division
which occurs just above Grand Island, and the max
imum grade for five miles in the seventh DIVISION
which occurs Just below the head Of Grand Island.
Iuuss ~ we uoOu ctd5e I'VE miles ABOVE. tNe
head of Grand Island the grade of the water line is
OPS feet per mile while below the anne point at the
same stage, in Steamboat slough the grade is O.75
feet, and in Old river 0.4S per mile showing the
effect OF the defective capacity past Grand Island in
holding the water back above
The initial point of the survey Of this depart
ment from which all distances on the river reck
oned, Is situated in mid channel in the main stream
the San joaquin and Sacramento cOmbined-on
range between the lower points Of New York slough
and Spoonbill creek, which Join the main channel
opposite to each other.
This point is opposite New York Landing, where
tidal observations we're made for determining low
water plane Of reference. Above this plane eieva-
tons given in feet.
The ninth division of the channel Is made 10 end
at the initial point, because there are not any OBJ
servations and data to give dimensions and slopes be-
low it.
The effect of the Suffer basin waters and channel
defects OF the Sacramento is in the food grade
line Of the fourth division, at the very high
est waters there perceptble fall in the river
lust above the mouth Of the Feather. The floods
from the Feather sometimes produce the same effect
FEATHER RIVER.
The grade line of Feather river is exceedingly
irregular The filling at the mouth Of the Yuba
above for six to eight miles during low water stage
and produces rapid descent for corresponding or
greater distance below This effect is apparent.
though in less marked degree, during the food
stage also.
The Suffer basin supply of water seriously dis
turbs the Feather river flood slope at times, by
afording greater quantity of water than the Sac
rarnento can carry below the mouth Of the Feather