Evening journal., 1907-03-04
Lie susquehanna Rrldae.

The improvements center IN the big
bridge at the mouth Of the river, which
lis located about 150 feet north Of the
old structure at this place. The pom
derous character Of this bridge may
be realized from the fact that it con-
tains 44.369 cubic yards Of masonry
and 20 ,23O,3S4 pounds Of iron and STEEL
The structure consists Of seventeen
fixed deck spans and a through draw
span 2SO feet long from center TO cen-
ter OF the rest piers.
The first fixed span on each end is
1876 feet inches long; the remaining
spans on the Havre de Grace end are
each 200 feet long. and on the Perry
lvlle end they are each $50 feet long
from center 10 center Of piers.
The fixed spans have a clearance OF
"a feet 3 inches at mean tide, and the
draw span has a clearance of SO feet
at mean tide. When opened the draw
presents a clear opening Of 100 feet
lon either side for the passage of YES
sells.
The bridge rests upon 20 piers Of
iAlleghany Mountain Sandstone with
lconcrete backing and Port Deposit
lgranite coping They are at right an
giles to the bridge. with the exception
lof the two rest piers for the draw,
which are swung Il degrees TO the
vest to bring them i'm line with the
current Of the river. Pier No 1, the
east abutment. was built by open cof-
iferdam construction on rock at an
elevation Of "A feet
improvements on Right Of Way.
Improvement Of curves is an import
ant feature of the work. and in so short
a distance II is rather remarkable that
the curvature has been so greatly re-
duced. Two bad curves are eliminated
south Of Havre de Grace, there being
2o5' curve to the left 2626 feet long,
Il followed by a tangent 400 feet long and
then a 1000 curve to the right 4537 feet
long. To offset this curvature, on the
new line the following curves have
been used: A Oo45' curve to the left
1888 feet long. then a tangent SS4l feet
long. followed by a 0o40' curve to the
right. s655 feet, which then returns to
the old line. There is one other curve
. on the line. near Principle, a 0o30'
curve to the right. 1900 feet long on
the oid line near this point there is a
! loco curve to the right 1900 feet long
The difference in degrees Of curvature
, between the old and the new lines is
! made up at the Principle end by going
iback on the curve there, which is a
.1o2O' curve to the left, GOO feet thus
throwing the new tangent 5000 further
north than the old tangent
y In making the changes upon the
Z main line. the junction with the Col
, umbia & Port Deposit r. r., Ca branch
/ of the p. B. & W. r. RI. was thrown
( 1900 feet north at Perryville. This
o Inecessitated making extensive altera-
'tions for about $3.50 feet and running
into the old line north Of F'renchtowr
station
Grade Crossings Eliminated.
All grade crossings on the main line
are eliminated for this stretch Of s l..
miles. and two out Of three crossings
= on the C. & p. d. branch are now
= made with undergrate bridges.
Between Principle and Perryville
y overhead crossing bridges have beer
u erected.
r Between Havre de Grace and Oak
lington five similar bridges have beer
e built and on the c. & T. ID. brancl
y have been constructed.
n The change Of line Excluding th'
n river BRIDGE involved the use Of $4,000
Il cubic yards Of masonry and necessi
y tated -745.O0O cubic yards OF excava
" ton. The masonry IS all Of Alleghan!
e Mountain sandstone with granit