, 1870-04-02
THE DETROIT RIVER TUNNEL.
The Surveys Mnde, Plans Prepared.
and Time and Cost OF ConxtFuctinE
the Tunnel Ef1cd-Canndinn Act OF
Incorporation
From the Chicago Tas7uray Eeri1r.

InE surveys l11ueS F10nS kfCphFGd4
and Time and Cost OF ConxtFuctinE
Incorporation.
From the Chicago Eas7ray Geri1r.
Plans for more speedy, certain, and adequate
River, 1t Detroit, date from the laying Of the
third rail on the Great Western Railway, con-
stitnting link in TINT route between Chicago
and the eeaboard, On which the problem Of
resder is referred, for detala upon this subject,
to Articles in the Rerie1c on the Michigan Cen
tral{An1il 2, 1862 and the Great Western Rail
way December IL, 1862. II will suffice to
state hers that the means Of transfer be-
tween the two lines consist OF two large and
ring through trains the other formerly used
for passengers, freight, and basEage) moro
particularly for local business ending At De-
tfoit. These means, though adequate thus
far, are neither 20 certain, go full, nor 30
economical as the rapidly growing business Of
ten years. projects for bridging and tunnefling
the nver have boen first seriously considered,
The first definite proposition,-ss we'll IS thu
first suggestion OF these projects, we, b1hese.
came from this side and it is largely due to
t1al mansgement sLai definite plan is now
2vsTered, whien meets with hearty favor, and
will receive all the necessary legislation in
CanAds, and TO the realization OF which ouly
municipal authorization from 4 city vitality in
tereeted therein, is needed On this side. This
is the plan Of a
,1'-.
connectinS fhe ternlnl OF AL railway lines run
ming to Detroit and Windsor.
ENGINEERING FEATURES OF THE TrSSE1.
Ar. e. 9. chesbrough, Chief Engineer, was
instructed By James Jog, Esq. to inyessi-
gate the feasibility Of the project. and his as
aa..M - 80 ~; "NiIu tne .Gaf cou1pteteu Tue
Tecsn,lS haan snhT,,ta's nn1 e''e nna1 l'ans nase
uest neen supanl.sGu. SC1., -..- H..
,,ht pssesea. s1pss1ns oeioM tl1 city waa nfst
los ~ lesso" thal eeItasn new
hs .cco,rt,, "a - 49, 10 "ua .uae osst
ro,shia .,"1 ~ pE. ene gl9ull WAS nn1a-
o.a.,, a, az ~ - ,ae sooa eioniu eh'ifeis
rs,cheti 40 t'0Ao ',' '''' p'esen' ios~@''on WAS
ieseneo"
ttSE'I1. ot7LsE.
1he Fronoaed line tincluling approacncsi,
may .'e saaa 10 begin At tile station al the
Michigan Central hallway, in Detroit, and will
Be OF tho surface to First street Between
First street and Cass street, there will be an
open cutting: but By favorable grade of tha
street, the Line will get under cover at Cass
street, and for short 1issalse will DO under .
GlIder covering
But the rising grade Of the street. and the
descending grade OF the t,lnncl render it ptac.
ticaole 10 commence aEchnE At Distance Of
Iof1E-eesen feet, Winch Will first he open cut
hne; Then double dack tunnel, OF covered
way Wlll be built.
Al distance Of nii,ety-two feet from the
l'clrolf portal. the circular fosIn Of the tunnels
WILL beStn 1Aence by two single track t,ln-
nels ~ the Canada portal Oh the Canada nidc;
thence by oren cutting fpr about half a mile:
a mile to the junction with ill.,. Great Western
HALLWAY, two miles iron, tAs Windsor Station.
TIE DETAILS OF THE rl-.S
are as sollowH4
Leu.tL Of tunnels. S5;3 fret 1r,r.at tn
portal
Grade in 80 on each side Of rirc-, with reg
feet Level below bed Of river.
Size, IL feet 6 inches interior diameter,
Share cylindrical.
ILscknrss of shell not under river, l tout 4
incllte.
The main tunnels to be fifty feet apart It
Is expected that ono will be constructed first.
I,r"n'o2e lE. q .sn,all circnlar tunuel.-fve
feet interiur,-b1ilt midway between tic muu
tunnels, mud below grade. This t:,.,ucl is to
c1teud across the river between tie two SHAFTS;
aud IL to be first constructed ,-nnt onlv to
drain the main tunnels during and after their
construction. hut (along its line, snf l,y
branches up 10 the main tunuels} to 4levclol,
as far d. possible the nature OF tho soil before
| their lmeAcemcnt. Ti.ia will nroy. u{ great
| utility il tie letting of tie contracts enabling
| the contractors to form estisnatcs and prorcca
with certainty. Everything. however. indicates
i! good gToun1.--the irorings lasit,. l,eeu maIu
| ut distances of not more than soy fert.
| .,o ExtHeaito" M aud -Nnso"ry.-Ihere will ba
A,ooo cubic yards Of excavation in open cl.-
theI - @ ~" cubic ynfis or excavation in tutl-
| nj "o.rH ttn'r sa!us o. hilcR masonry, ex-
ciSs3' y .. ota.Aase tu4if1e4; 80" cubic yards
OF sllo1e masonry.
s,,oter eo.HuY sp smls, zen 1set ln1enor ~
r. tto iva. Iu.twoo,, r,a; ns -" N, "," ~ Esa
.;N u tne nse., ", u."esh mAn ,annels, and con