Table 1 1
Saco River Jetties
Mouth of the Saco River, Maine
Date
Construction and Rehabilitation History
During this period
the north
Ledge) and
south (Hills Beach) jetties were constructed to lengths of 4,100 and
1912
4,800 ft, respectively. The north jetty had an elevation of +15 ft
mlw and an 8-ft crown width. The south jetty top elevation and width
were
ft
and
ft, respectively. Jetty side slopes were
The jetties are roughly parallel and spaced 700 ft apart
mately 1,600 ft bayward of the north jetty. The mean tide range is
8.8 ft.
The north jetty was extended 1,600 ft bayward. The design cross sec-
tion was identical to that used on the south jetty. The extension
1930
resulted in adjacent bayward ends of the jetties. Repairs were made
on the outer 1,600 ft of the south jetty. The repair cross section
was identical to the original design. Extension and repair costs
totaled ,800 with approximately 18,100and 2,450 tons of stone
placed on the north and south jetties, respectively.
The north jetty was extended 900
bayward, and at the landward end
a 160-ft section was repaired. The extension gave the jetty a total
1938
length of 6,600 ft, and the design cross section was similar to that
of the previous extension. The design cross section for the landward
repairs specified a +18
mlw elevation, a 12-ft crown width, and
side slopes.
The landward 700 ft of the north jetty were repaired to a crown
1958
mlw, a
crown width, and slopes of
elevation of +15
and
on the channel and bay sides, respectively. Stone size
varied from 0.5 to 7 tons or more, with 75 percent of the stone
averaging more than 5 tons apiece. Prior to the repairs, existing
to +15 ft mlw. A total of
center-line elevations varied from
5,100 tons of stone was placed for a cost of $ 3 8 , 0 0 0 .
Repairs were made at the landward ends of the jetties by placing a
seal blanket of 1- to 150-lb stone and 0.5- to 1.0-ton cover stone.
Repair sections were 1,000 and 1,100
in length on the north and
south jetties, respectively. The repair geometry was placed on the
bayside slope of the existing jetty sections, with a minimum
and a 2-ft cover layer. The north jetty
blanket thickness of 3
mlw crown elevation, various crown
widths from to 12 ft, a variable bayside slope matching the exist-
channel side slope. The south jetty design
ing slope, and a
mlw crown elevation, 3-ft crown width,
geometry consisted of a
side slopes. The cost for placing 16,600 tons of stone
and
was 9,000.
(Continued)
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