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Used the KRACH rankings...:

10-11:
http://www.bgoski.com/KRACH_OA_20110107.htm (Most recent)

09-10:
http://www.bgoski.com/KRACH_OA_20100228.htm (2009-10_FINAL)

...and found the following Ranking (largest DIF most improved) for most improved teams by subtracting most recent 10-11 overall Rank from 09-10 overall Rank:

RK DIF 10-11 09-10 TEAM
1 56 38 94 Dodge County
2 49 51 100 Holy Family Catholic/Waconia
3 48 24 72 Brainerd/Little Falls
4 46 57 103 Rochester John Marshall
5 40 5 45 Lakeville North
6 37 71 108 Mankato East/Loyola
7 35 42 77 Thief River Falls
8 33 13 46 Eastview
8 33 74 107 St. Francis/North Branch
10 32 25 57 Chaska/Chanhassen
11 28 30 58 Maple Grove
12 26 53 79 Bloomington Jefferson
13 25 19 44 Buffalo
14 24 26 50 Andover
14 24 37 61 Owatonna
16 21 66 87 Northfield
16 21 84 105 SB/TH/CC/Ely/B-E (Co-op now includes Babbitt-Embarrass)
18 20 12 32 Coon Rapids
19 19 40 59 St. Cloud
19 19 77 96 Albert Lea
19 19 100 119 Rochester Century
22 18 80 98 CambridgeIsanti/Mora/Pine City
23 17 23 40 Farmington
23 17 54 71 Chisago Lakes Area
23 17 84 101 SB/TH/CC/Ely/B-E (Co-op now includes SilverB/Two H/Cook Cty)
26 15 11 26 Crookston
26 15 20 35 Anoka
26 15 48 63 Wayzata
29 13 15 28 Rosemount
29 13 52 65 Alexandria
29 13 93 106 Minnehaha
32 12 10 22 Eden Prairie
32 12 44 56 Shakopee
32 12 50 62 Blaine
32 12 87 99 Moose Lake Area
36 11 31 42 Park of Cottage Grove
36 11 99 110 New Ulm
38 9 4 13 Benilde-St. Margaret's
38 9 61 70 Fergus Falls
38 9 102 111 St. Peter/L-H/M-L
41 8 7 15 Blake
41 8 9 17 Lakeville South
41 8 108 116 Marshall
41 8 110 118 Waseca
45 7 17 24 South St. Paul
45 7 41 48 Sartell/Sauk Rapids
45 7 85 92 Apple Valley
48 5 6 11 White Bear Lake
49 4 113 117 St. Louis Park
50 3 1 4 Minnetonka
50 3 46 49 Orono
50 3 94 97 Park Rapids Area
53 1 2 3 Edina
53 1 73 74 Mankato West
53 1 75 76 St. Paul
53 1 119 120 Fairmont
57 0 18 18 Hastings
57 0 29 29 Grand Rapids/Greenway
57 0 68 68 Morris/Benson Area
57 0 86 86 Hutchinson
57 0 114 114 Bloomington Kennedy
57 0 121 121 Redwood Valley
57 0 122 122 Windom Area
57 0 123 123 Worthington/Fulda/Spirit Lake
65 -1 55 54 Rochester Mayo
65 -1 89 88 International Falls
65 -1 103 102 Detroit Lakes
65 -1 116 115 Litchfield/Dassel-Cokato
69 -2 3 1 Warroad
69 -2 21 19 Centennial
69 -2 115 113 Pequot Lakes
72 -3 28 25 North Wright County
72 -3 63 60 Eveleth-Gilbert
74 -4 16 12 Stillwater Area
74 -4 79 75 New Prague
76 -5 39 34 East Grand Forks
77 -6 8 2 Roseville
77 -6 14 8 Hill-Murray
77 -6 70 64 Henry Sibley
77 -6 118 112 Luverne
81 -7 76 69 Simley
82 -8 59 51 Red Wing
82 -8 88 80 Willmar
84 -9 32 23 Mounds View
84 -9 56 47 Cretin-Derham Hall
86 -11 95 84 Winona
86 -11 120 109 LPGE/WDC
88 -12 64 52 Prior Lake
88 -12 65 53 Totino-Grace
88 -12 105 93 Minneapolis
88 -12 107 95 Austin
92 -13 34 21 Eagan
92 -13 49 36 C-E-C
92 -13 117 104 Robbinsdale Cooper
95 -14 97 83 St. Paul Blades
96 -15 106 91 Princeton
97 -16 43 27 Mound-Westonka
97 -16 82 66 Faribault
97 -16 101 85 Hibbing/Chisholm
100 -17 22 5 Irondale
101 -18 27 9 Roseau
101 -18 96 78 Mahtomedi
103 -19 62 43 Forest Lake
104 -22 111 89 Lake of the Woods
104 -22 112 90 Richfield
106 -23 33 10 Elk River/Zimmerman
106 -23 78 55 Rogers
106 -23 90 67 Spring Lk Pk/St. Anth Vill
106 -23 104 81 River Lakes
110 -25 45 20 Proctor/Herm/Duluth Marsh
110 -25 98 73 Tartan
112 -27 60 33 Duluth
112 -27 109 82 Holy Angels
114 -28 35 7 Breck
114 -28 58 30 Moorhead
116 -30 36 6 Hopkins
116 -30 69 39 Woodbury (Split from South Washington County Co-op w/East Ridge)
118 -33 47 14 Burnsville
119 -35 72 37 North Metro
120 -43 81 38 Robbinsdale Armstrong
121 -50 91 41 North St. Paul
122 -51 67 16 Bemidji
123 -52 83 31 Champlin Park
124 -53 92 39 East Ridge (Split from South Washington County Co-op w/Woodbury)

And the value of this is?

Since teams lose players at year end, wouldn't this be more useful (or at least interesting) if the comparisons were made week per week or every 2 weeks? Wouldn't that show which teams are improving during the current season and which teams are not?

Occasionally I receive requests to make comparisons like this – expanding on the KRACH ranking alone. There was a similar one from the end of last year (comparing one season to the next):

Most Improved Teams 08-09 to 09-10 via KRACH
http://www.ushsho.com/forums/viewtopic.php?t=24034

FWIW - What I understand the original request/intent to be was illustration of what teams improved "most" as these teams aren't always recognized if not ranked in the top 20. They did however make great improvement. One could argue that moving from 120 to 110 isn't as large of an improvement as moving from 20 to 10 but that aspect wasn't entirely the point of this request from what I understand.

I agree that an "in-season" or weekly comparison would be interesting as well.

At a quick glance - for me - this also:
1) Shows the short-term impact of creating or dissolving co-ops (e.g. SB/TH/CC/Ely/B-E or East Ridge/Woodbury respectively).
2) Confirmed what teams, confs, sections, classes, and geographic areas have moved-up or are rebuilding.

As to the "value" of this.... Hmm... I had to laugh at this question Not sure that there is much "value" in any of this. For some it's interesting - and they find whatever "value" they want from this Some don't understand or care (not to worry if you fall into the latter group ).

Bottom line? Game is still played on the rink and players & teams change from year-to-year (or even week-to-week)