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Blue-Green AlgaeJEREMY JENKINSLAKE PROTECTION / WATER RESOURCE MANAGERLIBERTY LAKE SEWER AND WATER DISTRICT
Answer to our problems?
Outline
What is blue-greenalgae
Physical characteristics
Transport
Impacts/Issues
Liberty Lake 2015
Management Issues
Source:http://cfb.unh.edu/phycokey/Choices/Cyanobacteria/cyanoblooms/Cyanobloom_17_600x450_lake-erie-essick_natl_geog.jpg
Zaca lake, CA
Blue Green Algae(aka: Cyanobacteria) Species
Anabena
Aphanizomenon
Microcystis
Planktothrix
Cylindrospermopsis*
Toxins Anatoxin-a
Microcystin-LR
Cylindrospermopsin*
*less common, spreading
Native, Natural, …
Algae found in almost allsurface waters
Makes up a portion ofplanktonic mass in awaterbody
Not generally eaten byothers, like green algae(primary producers)
Some self-regulatebuoyancy
Easily transported bywind and wave action Source: http://asteel33.tripod.com/id1.html
Transport
Buoyancy Light
Phosphorus
Nitrogen
Wind
Waves
Impacts
Reduced lightpenetration
DO depletion
Production of toxins
Aesthetics
Property Values
Drinking water
Animal deaths
Fish deaths
Source: http://toxische-cyanobakterien.de/index.php?rex_img_type=big&rex_img_file=dog_photo.jpg
Climate 2015 Low Snowfall (3 yrs running)
Mild Winter Temps
Ice-off: February 9th
Jump start to growingseason
High Spring/Summer Temps
High evaporative losses
No “recharge” with rain
SNOWFALL Actual (in.)Departure
from Normal(in.)
2015 32.9 -9.8
2014 35.0 -7.7
2013 26.3 -16.4
2012 51.8 9.1
2011 34.7 -8.0
2008(record) 132.6 89.9
20152011 2012 2013 2014
Water Year 2015Quartz Peak SNOTEL Site- 4,700 feetMica Peak (Washington)- 5,200 feet
Liberty Lake, WAAnnual Minimum Lake LevelElevation, 1953-present
2045.51
2046.01
2046.51
2047.01
2047.51
2048.01
2048.51
2049.01
2049.51
1940 1950 1960 1970 1980 1990 2000 2010 2020
MIN*: 2045.96 (1958)
MIN: 2046.32 (2005)
2046.0 (10/30/15)
Current: 2046.58 (9/21/15)
1993, LLSWD assumed lakelevel mgmt. from ECY
Oct. 30, ‘15
Sept. 21, ‘15
Liberty Lake
1970’s (Typical, pre-sewer) 2008 (Last significant b-g bloom)
Liberty Lake ‘15 Bloom
2015
8/18/16
7/29/16
‘15 - Bloom Duration
Full Bloom - July 30, 2015 All Clear - September 2, 2015
Management Issues - 1
Posting Criteria Differs by state
Human Health Concerns Illness
Death
Ecosystem Health Concerns Nutrient release
Organism die-off
Source: WALPA.org
Washington DOHRecreational Guidance
nwtoxicalgae.org
Idaho Blue-Green AlgaeResponse Plan Complaint-based DEQ Investigates Presence/Absence Volumetric cell-count Posting triggered by XX cells/mL
OR
Presence of scum ID of toxins
Management Issues - 2
Public Relations “No, I cannot remove
the gunk from the lake”
Messaging Residents
Local signs
Word of mouth
Recreational users
Access points
Media
Press release
