The herald., 1897-04-04

81, OO0 cubic feet OF concrete at
~ cents. l4,uoo
80, 52s, ,29s
Add for engineering, contlngen-
cies, etc., 10 per cent......... $37S, 494
Iotat ...... .............. $z,SVl, toi
ANCHORAGE AREA.
1t is believed that the anchorage area
afforded by this breakwater will meet all
requirements for many years, but If it
should ever prove inadequate, more area
can readily be added by extending the
eastern arm. This breakwater would
afford complete protection from all sea-
ward directions, while the east and north
east winds, coming from the shore require
no protective provision; Any seas which
breakwater could only reach shallow wa
ter, where no vessel would be anchored.
The protected area behind this breakwa-
ter estimated on the basis heretofore
specified, Is as follows:
Between breakwater and 8 fathom line
27S acres; between fathom line and 8
fathom line, 1876 acres; between fathom
line and 4 fathom line, 207 acres: between
breakwater and fathom line, 615 acres.
The deep water area is somewhat less
than that afforded by the Port Los Angel
es breakwater, but is ample for all re-
quirements for many years to come, az
the west arm crosses the fathom and &
fathom lines; the protection is complete in
this direction and the reduction by reason
of waves angling around the end would
occur only at the end of the east arm.
The character of the holding ground
all parties to he good. II is perhaps
in places little too hard, but not
enough so to form any substantial OBJ
lection. As harbor of refuge the area
behind this breakwater would seem to
meet all reasonable requirements. 1t
.,A fDr
by building long piers out from the shore,
as has been done at Port Los Angeles.
To reach the same depth of water these
piers would have to be about SOO3 feet
longer than the Port Los Angeles
pier, but one-half of the length
water, which could be replaced by q
solid embankment, the construction
being no more expensive in character
than that OF the Southern Pacific Railroad
between Wilmington and San Pedro. The
approaches to such piers would be practi-
cally without grade and Immediately ad-
jacent to the railroad tracks now in use,
as we'll as to the facilities of the existing
inner harbor The inner harbor however,
affords possibilities which may make tho
construction of such piers inexpedient.
INNER HARBOR.
The inner harbor now accommodates
vessels drawing 18 feet, there being IA
feet on the bar at low water. The en-.
| trance is between stone jetties 700 feet
| apart. The harbor as now utilized ex-
| tends 5000 feet from the mouth of the Jet
| ties to the lower end of Wilmington La
| COON, tidal fat basin having a high
water area of about two square miles and
a tidal prism corresponding perhaps to an
| average depth of three feet of high water
About 1000 feet of this channel, from the
Southern Pacific passenger station north
| Is now occupied by wharves which are
| practically continuous on the west side OF
| the channel, these wharves forming lon
gitudinal quay, alongside OF which yes.
sells are berthed. For 5000 feet south Of
| the Southern Pacific wharf there are mud
flats on each side of the channel in which
| basins could easily be excavated, there
I being room for O basin more than 2e00
| feet long and at least 500 feet wide on the
west side and for one one of about half
| these dimensions on the east side OF chan
mel 600 feet wide. The east basin could
be enlarged indefinitely by removing the
present jetty farther east. To ascertain
| the possible developments of this inner
harbor series of borings was made, ex-
tending from the upper end OF the
| wharves into the outer bay and beyond
the five fathom line, these borings being
generally carried to depth OF at least
| six fathoms below mean low water. These
| borings show that for distance of 1900
| feet inland from the end of the tetties the
bottom above the five fahom line is u
hard, black sandy clay, impregnated
boulders are found; it is materi al
through which pipe was forced slowly
| by the use of water jet, and materi al
which can be worked without serious
difficulty by hydraulic cutter dredRe.
Outside, Of the ietti:es .,t this s;al:, sag1s
and drops below the 5-fathom line about
| a thousand feet from the end of the wisst
| ietty. the deposit above IL being generally
! sand with little mixture OF gravel. lte-
yond the limits of the hard material. the
| bottom of the harbor, wherever examined
was practically pure sand, easily handled
| by n suction dredge. To open thirty
foot channel 400 feet wide from the upper
end of the present wharves to the 5-fath-
! ON line in San Pedro Bay would require
| the removal of about 2, 000, ,OOO cubic yards
! of material, all of a class which could 'be
readily dredged, and to open chennell q
| feet deep of the same width wouio take
about half of the amount.
| Here follows detailed technica! stydy
! of the conditions, which is summarizedii
| the following paragraph. a,
| While the extension of the 1etties ana
the deepening of the inner harbor may
not be necessary part OF TN sne anr lrneu,"sS nss,
| harbor provided for by law, they certainly
| are accessories which would within rea-
| sonable time and at O reasonable COST en-
/ able this harbor to meet every possible 10
uuirement of commerce In the most COM
| plete and satisfactory manner. Inc poasi-
| bility of such improvement OF tne inner
harhor bears, in commercial development,
much the same relation to the outer mar:
| l,or at San Pedro that the possibility OF
| filling behind a bulkhead bears to the pro-
| tected area behind the breakwater at Fori
Los Angeles.