New Orleans Republican., 1875-11-23
THE .JETTIES.
Final Proceedings of the Advisory Com.
mission of EnGineers Called by MIR.
Eads to Consider His Plans for the
South Pass .Ietties.

mission of EnGineers Called by MIR.
Eads to Consider His Plans for the
| South Pass Jetiies.
| PORT EADs, La, November Is, 1875.
The commissioners, General j. G. Bar.
nard. Sir Charles A. Hartley, W. Milnor
Roberts, Professor Henry Mitchell and II.
| D. Whtcomb, Assem- bled in New Orleans,
November Is, and proceeded to Port Eads
| on the seventeenth. After visiting the
works in progress the commission held a
meeting at Port Eads on the eighteenth
| Present-General j. G. Barnard, presi-
dent. Sir Charles A. Hartley, W. Minor
Roberts. Professor Henry Michel! and H.
! ID. WhitcOmb.
Communications were received from Gen
eral Alexander and Mr. Sickels s. lting that
pressing engagements prevented their at
tending he meeting.
| The president reed the minutes of the
meeting OF the ommissoners in New York
| IN September
| After some discussion it was recon-.
mended by the beard that the space of 600
feet between the north eud OF the west letty
| and the shore, across vb ch Ties are now
| driven aud mattresses beiIF laid, shop ID
not be closed until the east !, .ty shall have
| been raised to its full height out TO twenty
feet depth of water.
Mr.. Eads having intimated to the board
| that 1t is OF Importance TO fimself and his
associates tha5 depth of twenty feet
should be obtained at the mouth of the
South Pass as soon as possible the board
| recommends, in consideration of Mr.. Eads'
represent alton, that provisional jetty heads
| lOU feet i'll length be established in a depth
| OF twenty feet in the limo of both ietties,
and that the construction of these works
he in conformity with the cross section of a
| jetty presented by Mr. Eads.
This drawing indicates;
| L. That ths said iatty haa1o eboI onpe;,+
] OF stone and fasciue work having a width of
| twenty-six feet at the water line, with a
| slope OF three to one on both sides to a
| depth Of sixteen feet.
| = That below this depth the base of the
work shall have width of 222 feet, and,
Including revetment OF stone, be four feet
thick, thus giving an apron fifty feet wide
| at the foot of each slope.
That the apron and slopes shall have q
| revetment OF stone at least two feet thick,
| and
4. That the work be crowned with paw.
ing stones, weighing not less than one ton
each, carried up to a height of four teet
above mean low water.
The board further recommend that the
exposed sea ends of the temporary jetty
heads should have the same inclination as
| the side slopes it being understood that the
bottom out to the depth of thirty feet in the
proposed line of the east jetty is alread V
covered with at least one layer of mat
| tresses.
! With reference to the permanent ietty
| heads the board is of the opinion that their
construction, as regards profile fascines,
stones and piles, should be nearly as pos
| sible identical with that of the ietty heads
at the new mouth of the Maaa, where
the stones EMPLOYED in exposed positions
| averaged l20 pounds each. and where each
| cubic yard OF mattresswork was charged
I O ton Mt IL
considers that like covering of stone on
the mattresses should be employed in con-
| structing the jetties at the South Pass
wherever they sre liable to be attacked by
heavy seas.
The board then adjourned.
| PORT EADs, November 10, 1875.
| The board met at 8 P. NJ. Present, same
comm issioners as on the eighteenth. Pres
ent, also, Mr.. Eads. After conversation
and discussion the board adjourned without
action to A. NJ, the twentieth.
| PORT EADs, November 20, 1875.
| 1he beard met according 10 Adjournment.
| Present, same members as on last evening
| lhe following letter was submitted 70 the
| board and read, and ordered to be spread
on the minutes. The personal examinations
on the work made By the board confirm the
correctness of Mr., Corthell's statement:
| PORT EADs, November 10. lS7J
| Mr. G. ". R. Bayley Resident Engineer:
| DEAR SIR-The following is a statement
of work at this date:
| There have been driven as guide piles for
mattresses about $500 piles, excluding on
| the east jetty to q point about 3IOO feet
from East Point Signal, and about IL 500
| feet from same point on west jetty-meas-
ured on jetty lines
| Feet
The length of foundation mattresses laid in
The length Of second tier mattresses laid in
The length Of foundation mattresses LAID in N''V
west lefty ,.,........................ 1900
cioes uike is'''.'' ACKNOWLEDGEMENTS. 500
Total linear feet t'.......................23 al2
In which there are $4,000 cubic yards of
material all hrmlv secured in its position by
stone ballast. Sheet piling in the east jetty
has been driven length of $500 feet.
There have been constructed 800 lineal
feet Of launching ways for mattresses,
Houses and boats for the accommod alton Of
32o men have been placed on the west side
OF the pass, and on the east side large
mouse Tor heaGquarters' residence has been
oullt, ana all the shops, walks and wharves
necessary for work. The plant in the work
consists OF two floating pile drivers, three
sheet pile drivers, five derricks, eight model
barges, eight flats, two sternwheel ste am
yawls and other small boats.
AT the head OF the passes about 200 piles
have been driven on the line of the defect
ing dixie, and at the Jump 200 lineal fee. of
mattress ways have been constructed, with
accommodations in each place for all the
men required for the work.
an, sir, truly yours,
E. l.. CORTHELL,
= Chief Assistant Engineer.
Respectfully submitted to the chief en-
glneer. G. w. R. BAILEY,
Resident Engineer.
While the board appreciates the prepara-
tions made for carrying on the works with
vigor, 1t ia unanimously of opinion that a
rapid delivery OF stone on the works is es.
sential to obtain speedy depth on the bar,
and for the protection of the jetties where
they are exposed to the violence of the
waves; 1t therefore directs Mr.. Eads'
special attention to this subject, with the
suggestion that deposit of at least 10000
cubic yards OF stone be piled on the river
banks, near the mouth, as a reserve deposit
to meet emergencies during the construc.
ton OF the jetties in deep water.
NOVEMBER 20, 1875
Ihe commission adopted the following
general report and ordered it to be entered
into the minutes of its proceedings.
Alter having devoted three days to ex-
amining the works in progress, and in con-
ference with MIR. Eads and his engineers,
tne commission presents the following gem
eral summary of it's views:
Upon personal examination of the locality
and observation of the work which has been
performed, the South Pass of the Mississippi
10 found by the commission to more than
fulhll the expectation of its members in re-
gard TO Its fitness for furnishing an open
mouth OF ample depth for the largest class