Topics
A to Z
Data &
 Statistics
Forms &
Publications
News &
Advisories
Licensing &
Certification
Rules &
Regulations
Public Health
Directory
Print this Article   Bookmark and Share
2011

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