Table 37
Block Island Harbor of Refuge Breakwaters
Block Island, R.I.
Construction and Rehabilitation History
The east and west rubble-mound breakwaters were constructed to
1894
The east breakwater was built to
mlw with an
top
mlw with a 20-ft
width, and the west breakwater was built to
crest width. The sea and harbor side slopes on both structures were
and
respectively. A total of 107,400 tons of stone
was used in constructing the east breakwater, and at least
18,400 tons of stone were used on the west breakwater. In 1 9 minor
80
repairs were made to the east breakwater using 420 tons of stone.
The east breakwater was repaired using a total of 19,970 tons of
1906
stone at a total cost of ,900.
Repairs were made at the landward and seaward ends of the east
1916
breakwater using a total of 5,930 tons of stone.
Repairs were made to the east breakwater using 3,360 tons of stone
for a total cost of ,000.
The west breakwater was repaired to its design cross section using
1950
0.25- to 6-ton cover stone and ' r n of quarry" core stone. Typical
'u
crest elevations prior to repairs were from 1.5 to 3.0 ft below the
ft mlw. Total cost of the repair was
design elevation of
7,100 using 12,900 tons of stone.
An 800-ft section of east breakwater was repaired and sand tightened
1955
by placing 0.75-in. to 200-lb core stone and 1- to 6-ton cover stone.
The stone was placed on the breakwater's seaward side slope beginning
at a point opposite the northeast corner of the inner basin and
terminating about 750
from the structure's seaward end. The cross
mlw, the crown width extended
section had a crown elevation of + 1 1
seaward 25 ft from the existing breakwater center line, and the side
A total of 12,000 tons of stone was placed for a
slope was
total cost of
The seaward 842 ft of the east breakwater were repaired using
to
8-ton stone. Prior to repair, center-line elevations were from
to
1963
r n l w along the
-2 ft r l on the seawardmost 200 ft,
nw
to +12
remaining 642
of repairs, and
to +12
mlw landward of the
repairs. The repair crown section consisted of a + 1 1 ft r l crown
nw
elevation, an 18-ft crown width, and slopes of
and
on
the harbor and sea sides, respectively. Most of the stone was placed
on the sea-side slope. A total of 11,700 tons of stone was used for
a total cost of 8,000.
(Continued)
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