This page provides information related to current recreation water quality health advisories involving cyanobacteria harmful algal blooms (HABs) and E. coli bacteria. The map is updated with the most current information as health advisories are issued and lifted throughout the season.
Recreation Water Bloom Advisories and Warnings
The map below provides additional information for active health advisories. Click on the marker in the map for updates.
The table below is a list of active health advisories. When the advisory is lifted it will be removed from this list and added to the Lifted Advisory table.
|County||Waterbody||Date Issued||Dominant Taxa||DEQ Contact|
|Kootenai||Black Lake||October 7, 2021||Aphanizomenon||DEC Coeur d'Alene:(208) 769-1422; Panhandle Health District: (208) 415-5100|
|Bonner||Boyer Slough||August 20, 2021||Aphanizomenon||(208) 769-1422: Panhandle Health District: (208) 415-5100|
|Kootenai||Cave Lake||October 7, 2021||Woronichinia||DEQ Coeur d'Alene:(208) 769-1422; Panhandle Health District: (208) 415-5100|
|Bonner||Chuck Slough||August 27, 2021||Dolichospermum||Health District (800) 878-2364 / DEQ (208) 769-1422|
|Clearwater||Elk Creek Reservoir||August 4, 2021||Dolichospermum||Idaho North Central District: Tara Macke (208) 799-3100; DEQ Lewiston: Sujata Connell (208) 799-4370|
|Kootenai||Fernan Lake||July 28, 2021||Panhandle Health: Katherine Hoyer (208) 415-5108; DEQ: Kristin Lowell (208) 769-1422|
|Kootenai||Hauser Lake||October 7, 2021||Dolichospermum||DEQ Coeur d'Alene:(208) 769-1422; Panhandle Health District: (208) 415-5100|
|Kootenai||Hayden Lake - North of McCleans Bay (where it is shallow with an abundance of aquatic vegetation; including McCleans Bay).||7/27/2021||Dolichospermum||Panhandle Health: Katherine Hoyer (208) 415-5108; DEQ: Kristin Lowell (208) 769-1422|
|Fremont||Henrys Lake||September 10, 2021||Dolichospermum||DEQ: (208) 528-2695; Eastern Idaho Public Health: (208) 522-0310|
|Latah||Hordemann Pond - Closed Until Further Notice||July 26, 2021||Dolichospermum||City of Moscow: David Schott email@example.com, (208) 883-7098; Sujata Connell Sujata.Connell@deq.idaho.gov, (208) 799-4370|
|Fremont||Upper Island Park Reservoir shoreline||September 10, 2021||DEQ: (208) 528-2695; Eastern Idaho Public Health: (208) 522-0310|
|Canyon||Lake Lowell||August 6, 2021||Dolichospermum||Dani Terhaar (208) 373-0550|
|Twin Falls County||Magic Reservoir||August 9, 2021||Aphanizomenon||Twin Falls Regional Office (208) 736-2190|
|Nez Perce||Mann Lake||August 13, 2021||Microcystis||Lewiston Regional Office (208) 799-4370 / (877) 541-3304|
|Bonner||Sagle Slough and Comeback Bay||August 4, 2021||Dolichospermum spp. and Microcystis. September 24 update: surface scum observed along shoreline. During microscopy, DEQ observed Dolichospermum spp. in a high concentration as well as Microcystis.||Panhandle Health: Katherine Hoyer (208) 415-5108; DEQ: Kristin Lowell (208) 769-1422|
|Twin Falls County||Salmon Falls Creek Reservoir||August 9, 2021||Gloeotrichia||Twin Falls Regional Office (208) 736-2190|
|Twin Falls County||Salmon Falls Reservoir||August 9, 2021||Microcystin||South Central Public Health District 866-710-9775|
|Bonner||Solomon Lake||September 13, 2021||Dolichospermum||DEQ Coeur d'Alene: (208) 769-1422; Panhandle Health District: (208) 415-5100|
|Kootenai||Spirit Lake||August 23, 2021||Dolichospermum - September 3 update: scum was observed and cell counts remains high||Coeur d'Alene Regional Office (208) 769-1422 / Health District (800) 878-2364|
|Latah||Spring Valley Reservoir||October 6, 2021||Woronichinia||DEQ: (208) 799-4370; PH-INCD: (208) 799-3100|
Currently, all health advisories issued are active. We will update the Lifted Advisory table when an advisory is no longer active.
|County||Waterbody||Date Issued||Date Lifted|
|Adams||Hells Canyon Reservoir||08/06/2021||10/08/2021|
|Bonner||Priest Lake Outlet: From Outlet Bay Road (48.4934, -116.8907) to the dam||8/27/2021||9/10/2021|
Report a Health Concern
Idaho’s health agencies are responsible for educating and advising the public on cyanobacteria exposures.
Idaho’s seven public health districts develop public health advisories, in consultation with DEQ, based on lab result analysis. The Idaho Department of Health and Welfare maintains a Harmful Algal Blooms FAQ page and Waterborne Illness page, which contain educational material and general information about potential illnesses from recreational waters and drinking water.
Report a Potential Cyanobacteria Harmful Algal Bloom
Use the link below to provide information about a potential cyanobacteria harmful algal bloom.