Table A7. Timing of ice impacts to structures or operations, by Division (as of 1995).
Structure or
Missouri North
North
New
North
Ohio
South
South-
operation
River
Atlantic
Central
England
Pacific
River
Pacific
western
Navigational
Freezeup
0
0
3
0
2
0
0
0
locks
Breakup
0
0
0
0
0
2
0
0
Both
0
1
15
0
0
2
0
0
N/A
31
10
14
1
8
0
2
1
Navigational
Freezeup
0
1
4
0
2
0
0
0
structures
Breakup
1
1
0
0
0
1
0
0
Both
0
0
5
0
0
1
0
0
N/A
30
9
23
1
8
2
2
1
Navigation
Freezeup
2
1
6
0
1
1
0
0
traffic
Breakup
0
0
1
0
1
0
0
0
Both
0
1
10
0
2
2
0
0
N/A
29
9
15
1
6
1
2
1
Hydroelectric
Freezeup
2
1
0
0
3
1
0
0
power
Breakup
1
1
2
0
1
0
0
0
generation
Both
1
0
2
1
0
0
0
0
N/A
27
9
28
0
6
3
2
1
Municipal
Freezeup
5
1
1
0
2
1
0
0
water supply
Breakup
0
1
0
1
0
0
0
0
intakes
Both
1
0
1
0
0
0
0
0
N/A
25
9
30
0
8
3
2
1
Powerplant water
Freezeup
4
1
0
0
2
1
0
0
intakes
Breakup
0
1
0
0
1
0
0
0
Both
0
0
2
1
1
0
0
0
N/A
27
9
30
0
6
3
2
1
Flood control
Freezeup
7
1
4
0
5
2
0
0
structures
Breakup
6
5
9
0
1
2
0
0
Both
5
3
8
1
0
0
1
0
N/A
13
2
11
0
4
0
1
1
39
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