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The 2011 bloom season extended from June into February, 2012. Eighteen advisories were issued that were in effect for a total of 1,175 days (advisory-days). This was the first season that had an added requirement to test for both cell counts and toxins before an advisory could be lifted. Get complete details in the 2011 Bloom Season Recap (pdf).

This map displays the location of each advisory (in sequence). See the chart for detailed information, including links to the original advisories. Links are displayed by the date an advisory was issued (start date) or lifted (end date).

 Advisories in Oregon

No. Waterbody Region County Dominant Species Start Date End Date No. of Days
1 Cougar Reservoir Willamette Lane Anabaena 6/14/2011 7/19/2011  35 
2 Lost Creek Lake Southwest Jackson Anabaena

6/20/2011

 7/11/2011 21 
3 Cullaby Lake Northwest Clatsop Aphanizomenon 7/1/2011  

9/01/2011

62
4 Fish Lake Southwest Jackson Anabaena

7/1/2011

 7/25/2011  24
5 Willow Creek Reservoir Northeast Morrow Anabaena 7/11/2011   8/8/2011 28
6 Diamond Lake Southwest Douglas Anabaena 7/29/2011   8/9/2011 11
7 S. Umpqua River, near Myrtle Creek Southwest Douglas Microcystis 7/29/2011

1/09/2012 

164 
8 Dexter Reservoir Willamette Lane Anabaena 8/19/2011 10/14/2011  56
9 Gerber Reservoir Southeast Klamath Aphanizomenon 8/23/2011  1/31/2012 161
10 Sru Lake Southwest Coos Anabaena 8/24/2011 2/07/2012 167
11 South Tenmile Lake Southwest Coos Aphanizomenon 8/25/2011 11/21/2011 88 
12 Lemolo Lake Southwest Douglas Anabaena 8/31/2011   9/19/2011   19
13 Willow Creek Reservoir Northeast Morrow  Aphanizomenon 9/7/2011

11/09/2011

63
14 North Fork Reservoir Willamette Clackamas Anabaena  9/8/2011

9/23/2011

15 
15 Timothy Lake Willamette Clackamas Anabaena  9/8/2011

9/23/2011

15
16 Dorena Reservoir Willamette Lane Gloeotrichia 9/19/2011  

10/24/2011

35
17 Fall Creek Reservoir Willamette Lane Gloeotrichia 9/20/2011

12/30/2011

101
18 Lost Creek Lake Southwest Jackson Aphanizomenon 9/23/2011

1/11/2012

110