, 1877-10-09
EADS' JETTIES.
No Isar Formtng-ClRlms = Complete snc.


No Isar Formtng-ClRln1s y Complete snc.
cess.
I'VE give tho following extracts from Capt.
Eads' letter to the President Of the South Pass
JottY Company In regard to Ills jotties:
The following extracts from MI official letter
dated Jau. =. 1874, tn tic Hon. tjcorgu w,
Chief ot Engineers, U. S. H., ald read tn thu
House nj Representatives when the Jctfv bit
was defeated. lurinE tho first session OF tho
Fnrty.tl,irsl CongrUs. lliustratB sumo OF the
technIsal opposcrs oi the n measure At tliat Tine:
The je.ties cannot DO extended indefinitely; tho
effect Of thetr extcnsfnn Will b+ 10 rrtitice tho
xo1amo Of discharge oi ths jcsty pass Pay and tisett
s fSo ~ ssa'hns III ys"% % I'd: ;sns ss su Il
where's. the advanrc of the har In is uatIsal stato
during that pcrIod woaId IL, atn,nt two nEtes.
The eartty matter pushed alonx the hottarn Of
deepening lho channel ata accelesatns Tho current
BY lcau* Of tet,cs than Il wss before; but instead
I'D IL lei M avery y yss,. It viii Win jst,iss nd viii
the drpth Of channel required In tho bill, grow
abou. i.::oo fecs every yesr.
Agatnst this charge Capt: Eads replies:
In view OF the proplleaed failure 0f the let
ties, ii seems curious that the most rcnalkatiu
rfenomcnnn developed by their construction,
namely. the deepening OF tho sca-bott0m in thH
precise locality wllcr0 tho new ah0nl was su
thcss @ predictions, but that IL should likewise
provo iae existence Of y littoral or shore cur
rent in the sea Towing almost constantly frn,n
tho east, and passing transycrscIy under tho
river di,ehafge, " % which t!,e sea,bottom e: Is
IL Increased. Ths sxttcnve Of this cur:
tha jet,tte., and t1isr predicted tH!'Hrs
cneo Of such current could nat, however, cause
tE,cIr failure, lloF involve All extension 0f the
1ettios within the next half'ceuturT, 10 my opin-
lou; but thu existence ot 1t must postpone the
question Of their psolongst'on fsr beyond tho
About year after the jettIes were begun, =
survey that WA made BY my sssistaut engineers
Of the aeabotto1n In al arcA Of aftY-ohc acrea
the fact that, Instead Of tho predicted reforIna-
tiDn OF thu liar, there had heeil au actual aver
age increase OF nearly two and . half feet in
depth throughout thls urea. About the tiu,e
W. had 4issovercd this fart, Mai. Howell, United
States Engineers, published statement to The
effect that an examination of the bur Iuale BY
hin showed that q new bar was l0rulinE lnllae-
alsts'y In aayanea Ut tho jettscs.
The .t.temen. made by The Superintendent
In compliance with the resolution Of the House
Mas ~ effect, that. In area VI 100 yards square
{aDout loo acrea} Immediately In front Of the
My. 1875, and May, 1871 Of q. ao0 cuoc yaris,
lhe comparative chart Of the Two surveys
showe1 tlaat the average depth of tho ls9
aoundinRs made In this area, iu 1876. WAS 81 ind
0-lO leet, while the averus0 Of tbs Isl soundings
lnade ~ 1t In 1876 was ,a5 aud G.l0 feet, the
average increase In depth betng aud ITO feet.
But such reference was made to tho Incomplete
ness of the last survey tu tht statement Of the
Superintendent that IT. testimony waa much
impaired aud the public were left still n doubt
ou the question ut Issue.
4 second survey, ma1o by my sssistants Last
May, showed that. In the dftY-ona acres preYi-
ously Investigated ty them, there had been m
additional average tnteaso Of nearly two and
. total deepening, u nearly i've feet &lnre Tho
survey Of Sir. Marindtu III ISIS. A. the late
United States Inspector, Gen. Comstock. hal
failed to report any 4eebculuE tn tEont Of the
jstIies. complained ol thu i4et bJ letter to the