The Baltimore County union. [volume] (Towsontown, Md.) 1865-1909, 1882-01-28
Interesting Facts About Koch Rarsn.

Chief Engineer Raber, X. Martin. in his
annual report 90 the City Water Board. furnishes
interesting facts relative e. ivsh Raven. lie
says:
This storage lake {. situated in the bed q the
Gunpowder falls, and l. formed By the erection u
n stone dam, near Mine Bank run. o. heavy rub
bic and cut masonry across the falls near that
point. The surface % water Of Loeb Raven when
full is l7o feet above tide. The area flooded by
water IL 252 acres. its capacity j. $40. O00, coo
gallons. aud is depth varies from 20 20 feet.
IT. length j. 81 miles, and it, width varies from
leo 90 SEQ feet. The land either side Of the
Loeb. for the greater portion Of it, length il rocky
and p'ecipitous and generally well iimbered.
Loeb Raven was virtually completed in 1859.
Daring the past year some little work was done
such a. repairing and riprappihg with stone
leyec bank at the upper end Of the loeb that had
been washed away by freshet last spring. The
waste gates al the dam closed September %.
issi. and on October 5th the waters Of the Gun.
powder fails passed the over-iall Of the dam.
Daring the year there vas expended upon Lock
Raven ST,255.23.
''At the close of the season Of issi the dam was
completed on both sides. and the centre gap from
the surface of Of the stream the crest line
top 81 the dam, was unfinished. The gate
chambers were completed. and all the iron gates
aud connections were in position. The daily How
Of the Gunpowder was passed through the waste
gates. except during freshe,s or unusual rises of
the stream, when the water flowed through the
centre gap ofihc dam. The laying ofthe masonry
in this eenirc gap, together with some few peFches
of the stone floor 81 the gate ehambers. l. what
was done during the past year. On the 9th of
October the last stone in connection with the con
tract for building the dam was laid. The core of
the dam Is bull; q heavy rubbie masonry. laid In
hydraulic cement, in the most careful aud best
possible manner. The stones composing the
oyer-fall o; the dam Of Baltimore county white
marble four fee, long two feet wide aud three feet
deep. All foundations Of the dam proper. the
wings and the gate chambers. not only laid
upon bedrock hu; are also well sunk into the
Aud the white marble stones composing the over
fail Of the dam. besides being laid like the ring
stones q arch. also heeled or built against
the bed rock at the 700, Of the dam. The thick
mess e masonry at the foundation il GO feet. The
depth of the foundation below the original surface
i ~ feet. The width Of the overflow IL 500 feet.
The wings extend into the hill each side ESQ
feet The height FROM the extreme foundation 10
the overflow IL - feet. The wings on each side
= filling Of earth the inside O. feet thick at the
base. aud just back Of the masonry 10 = puddle
two feet thick. extending the whole length Of
the dam from the bel rock 10 the top. The In
terror Of the gate chambers i built % white
bic smooth cut masonry the exterior Of blue
stone. rock ashlar face. and the centre Of heavy
rubbie work. well laid in hydraulic eemcn; and
grouted. There expended upon the dam in
1851. in finishing the work. so. 3G9.6t. There
has been built white marble gate house over the
gate chambers at the dam during the year at
cost Of SO 0S- 10"