Ontonagon Harbor Piers
Construction and Rehabilitation History
Construction of the inner 1,069 ft of the west pier (Figures 28
and 29, Section E) occurred during this time. This structure con-
sisted of woodpiling filled with stone. The pier width ranged from
8.5 to 1 1 ft.
The outer 1,515 ft of the east pier (Figures 28 and 29, Section A )
was built during this period. This was a rock-filled timber crib
structure. The pier was 20 ft wide and had stone toe protection at
Construction of 1,398 ft of the west pier (Figures 28 and 29, Sec-
tion A) progressed. The pier had the same cross section as the pier
built during 1868-79.
Construction of an additional 255 ft of the east pier (Figures 28
and 29, Section
was completed. This was a 20-ft-wide stone-filled
timber crib structure with stone toe protection.
The inner 545 ft of the east pier (Figures 28 and 29, Section
built. This pier also was a stone-filled timber crib structure with
a 20-ft crest width.
A stone superstructure was built on 1,515 and 1,398 ft of the east
The el of these
A concrete cap (superstructure) was constructed on the inner 1,069 ft
The el of the channel side
of the pier was
A stone and concrete cap (superstructure) was installed on 800 ft of
the east pier (Figure 29, Sections B and C). The shoreward 545 ft of
structure had a crest el of
ft lwd (Section C ) , while the remain-
ft lwd (Section B.
ing pier had an el of
The 96-ft-long west pierhead was rebuilt with steel sheetpiling that
was stone filled. It was capped with 5-ton minimum cover stone. The
pierhead was 22 ft wide with a crest el of
ft lwd. Riprap was in-
stalled to provide toe protection. It is not clear when the pierhead
was originally constructed.
A structural inspection of the piers was made.
A void up to 20 ft
wide was observed on the west pier, and sand was being lost through
the cribbing under the superstructure. Additional stone was required