Presque Isle Harbor Breakwater
Presque Isle, Michigan
Construction and Rehabilitation History
Construction of a 1,053-ft-long breakwater was performed during this
period (Figures 45 and 46, Section B. The structure was a 24-ft-
wide stone-filled timber crib breakwater with riprap toe protection.
A 163-ft-long stone-filled timber crib breakwater (16 ft wide) was
completed connecting the original structure to shore (Figures 45
and 46, Section A ) .
A stone and concrete capped superstructure was built on the existing
The crest el of
the structure was
Construction of the breakwater head was completed. The structure was
a stone-filled timber crib breakwater that was 30 ft in width (Fig-
ures 45 and 46, Section D. The stone portion of the substructure
and stone placed on the lakeward side of the breakwater were in-
stalled at an el of
Armor stone on the lakeside and toe
protection on the harbor side of the structure were in the 10-ton
range. The concrete superstructure was built to an el of +16 ft
for a lighthouse.
A 1,600-ft-long rubble-mound breakwater was constructed connecting
the breakwater head to the existing structure (Figures 45 and 46,
Section C ) . The crest was 12 ft wide with an el of
ft lwd. Ten-
ton armor stone was used.
Riprap cover stone (5.5 ton) was installed for a distance of 180 ft
the harbor side and 400 ft on the lakeward side of the original
timber crib structure (Figure 46, Section B.
The inner 1,216 ft of
breakwater was rehabilitated for a cost of ,500.
An inspection of the site indicated that the outermost portion of the
rubble-mound breakwater needed some minor stone rearranging. This
work was completed later in the year.
The breakwater presently is in good condition. An aerial view of
Presque Isle Harbor breakwater is shown in Figure 47.