Rock Island daily Argus. (Rock Island, Ill.) 1886-1893, 1890-10-30
PLANS FOR HENkEPiN
Engineer Marshall Furnishes Some
Facts.
Votiine OF the Expenditures Under
the sS0O,OOO Appropriation The
locks and Feeder.

United States engineer, Captain w. I,
Marshall, has made the following es,;.
mates and plans for the Hennepin can.
Tor which an appropriation of $500. OO(
Tor preliminary work was passed by thu
last congress:
The adopted line over the route. an.
proved by the secretary of war. Octobe,
~, 1888. is from the Illinois river abou,
one and three fourth miles above ,he
to"n OF Hennepin, at the great bend Of
the Illinois river. thence via Bureau
Creek valley. Penny's slough and Rocl
river 10 the Mississippi river, with a feed
or 70 Rock river. near Dixon, Hin dis.
The canal reaches the summit level a,
the Goth mile from the Illinois river sfte,
an ascent of 205 feet. through "a locks
WIN iiits varying from feet to 10 fee
each.
The summit level extends from the
10Th to the 25th mile. where the Dixon
feeder JOINS II, and continues unchanged
TO the 25th mile.
From the 35th mile to Milan. near the
mouth OF Rock river. the route ia vi,
Pennls slough and Rock river to the
mouth oil Rock river. this tern mus af.
fording capacious harbor and entrance
TO the Mississippi end of the canal.
The total locksge on the desce Mt from
the summit level to the mouth Of Rock
river is 1O2 feet. made by Is locks, vsry.
ing In lifts from 3 TO 10 feet. TIE length
OF the western slope from the feeder
junction to the Mississippi is SO miles.
The main line is n miles in length, OF
which so miles is canal and 81 mile.
slack water navigation In Rock river by
locks and dams.
Upon the main line the follow ing con.
structions are necessary:
DOCKS.
Thirty feet wide, 40 feet between
quoins. seven feet deep; two blocks of
feet lift; one of feet: three of G feet
three of Z feet; one of 8 feet; thirteen o.
feet; ten of 10 feet
Among the locks of foog lift is ,
lock of novel construction ut M Ian. with
one set of upper gates and two sets o.
lower gates. giving double exit, on,
into canal below the Milan dam TO bt
used at low water. and the other into
ROCK river TO be used when ii at stream
Is from five TO six feet above low water.
And among the locks of 10 foot lift i.
included one combined lock Of two II
foot lifts.
Aqueducts-Five squeducts, respect
lively. $50. 800. 240. $50. 430 feet il
length and 40 feet in width of trunk.
Culverts-There are Al culyerts; mint
30 inch iron pipe; 12 4S inch iron pipe
four, each two As inch pipe; eight IL
loot span masonry arches each; five /:
foot span masonry arches each, and on,
with 30 foot span eQueduct.
TIE FEEDER ROUTE.
To avoid the difficult and expensive,
passage through the streets of Dixon
and the construction of street and rail
road bridges, covered canals and othe
works IT is proposed that the feeder shall
leave Rock river at point about two
and one half miles below Dixon, thu
shortening its length by that distance
The feeder will be nsvigsble. and of tn,
same dimens ons as the main line Tn,
total length of the feeder " i'll be 8 43.
| miles
The constructions required upon tn
feeder are as follows: One gu ard lock a
the entrance to Rock river. one dan
across Rock river. with a comfortable
sluicewsy closed by gates of the Par
ker" modified bear trap pattern; ont
set of sluicegstes for supply of feeder
one aqueduct 20 feet wide, 100 feet long
over Green river; three pivot RAILROAD
bridges. 80 highway and farm bridges. q
culveIts. ranging in dimension from &c
inch cast iron pipe to double spans of IL
foot masonry arches.