Struc-
ture
Structure Date
Type
Construction
Improve-
Length
of
Table
Location
Materials**
No.*
Origin
ft
ment
Lake Superior
TC, ,C,CC
1
Grand Marais
1,719
1883
M
Harbor, Minn.
2 ,5 2 8
M
Two Harbors, Minn.
1893
2
245
3
TC,S
1957
Knife River Harbor,
M
Minn.
13,650
4
1898
R
Duluth-Superior
Harbor, Minn. and
wis.
,s,cc,
1,806
R
1903
5
Port Wing Harbor,
.
wis
N
1957
6
1,468
Cornucopia Harbor,
wis.
N
1936
7
242
Bayfield Harbor,
wis ,
N
1967
8
La Pointe Harbor,
200
wis.
8 , 00
9
Ashland Harbor,
0
1889
N
wis.
1,033
1965
10
N
Saxon Harbor, Wis.
1,380
1957
11
Black River Harbor,
N
S
Mich.
1868
4,782
N
12
Ontonagon Harbor,
Mich.
(Continued
*
- breakwater, J - jetty, and P - pier) and number of structures
Type
indicates 3 breakwaters).
**
C - concrete, CC - concrete cap, S - stone, TD - timber deck, TC - timber
- wood piling, CSSP - cellular steel sheet pile, - steel sheet
crib,
pile.
M - modification, R - rehabilitation, N - none, D - dolosse, Z-W - Z-wall,
G - Gabion, SP - Sta-pod.
(Sheet 1 of 8)
11
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