Draft Integrated Weed Management Plan For The Tahoe Keys Lagoons Presentation to the TRPA Board of Directors September 23, 2015
Aquatic Weeds Removed from the Tahoe Keys 20,000 18,600 18,300 17,500 18,000 16,700 16,000 Volume in Cubic Yards 13,400 14,000 12,000 10,000 8,000 6,000 4,400 4,000 1,800 1,425 2,000 650 550 350 100 0 1984 1985 1986 1987 1988 1989 2007 2010 2011 2012 2013 2014 Year September 23, 2015 2
Tahoe Keys Landowners Tahoe Keys Property Owners Association Tahoe Keys Beach TKV Tahoe Keys & Harbor Properties Homeowners Association Tahoe Keys CA Tahoe Lagoon Marina and Conservancy Associates, Inc. Yacht Club September 23, 2015 Tahoe Keys Property Owners Association 3
IWMP Research & Development 2011 2012 2013 2014 2015 2016 2017 Previous Plans, Consultations, and Experiments Agency Scoping on Content/Process Draft IWMP Preparation Expert Panel Review/ Input September 23, 2015 Tahoe Keys Property Owners Association 4
IWMP Next Steps 2011 2012 2013 2014 2015 2016 2017 Public Review of Draft IWMP Refine and Submit Proposed Plan to Agencies Formal Agency and Public Review/ Permitting September 23, 2015 Tahoe Keys Property Owners Association 5
Tahoe Keys Property Owners Integrated Weed Management Plan Overview Orientation to the Tahoe Keys Lagoons Aquatic weed problem Need for improved management approach Goals and Objectives the plan IWMP review process: >Public and Agency Input >Expert Panel Input Summary Photo credit: Lake Tahoe Real Estate www.laketahoerealestateblog.com
Tahoe Keys- South Lake Tahoe Lake Tahoe Main Lagoon West Channel Lake Tallac East Channel Marina Lagoon Photo credit: Lake Tahoe Real Estate www.laketahoerealestateblog.com
Tahoe Keys- South Lake Tahoe • 1,500 Homes, 950 docks, 1,400 boats • Commercial Marina and Boat Launch • Narrow surface connections to Lake Tahoe • Eight land owners/managers • Shallow, warm water Three aquatic weeds degrade beneficial uses of the Keys Lagoons: > 90% of Lagoon waters are affected September 23, 2015 Tahoe Keys Property Owners Association 8
Non-native and nuisance plants in the Tahoe Keys: • Eurasian watermilfoil ( Myriophyllum spicatum ) • Curlyleaf pondweed ( Potamogeton crispus ) • Native Coontail ( Ceratophyllum demersum ) P. crispus turions: M. spicatum P. crispus Produced in early summer; Sprout in fall 9 Tahoe Keys Property Owners Association September 23, 2015
Tahoe Keys – Priority for Lake Tahoe Lakewide AIS Implementation Plan o Aquatic invasive plants in Tahoe Keys o Warm-water fish using habitat created by invasive plants Eurasian watermilfoil o First found in Tahoe Keys in 1980s o Now appears in many Lake Tahoe near-shore zones Curlyleaf pondweed o First found in Tahoe Keys Channels in 2003 o Now has established throughout Tahoe Keys Lagoons o IWMP Expert Review Panel concerns about increasing risks to Lake Tahoe o Habitat not limited to near-shore zones Tahoe Keys Property Owners Association 10 September 23, 2015
2014 TKPOA Survey (point sampling) RED Areas = 100 % Eurasian watermilfoil
Current Management Relies on Aquatic Weed Harvesters • 5 Harvesters • 4 Work Boats • 12 Seasonal Employees • Training • Insurance • Administrati on • >$400k/Yr • Not Controlling Weeds Well • Contribute plant fragments September 23, 2015 Tahoe Keys Property Owners Association 12
IWMP Goal To help protect the ecology, to enhance the recreational and aesthetic qualities, and to maintain the commercial uses of Lake Tahoe by controlling nuisance aquatic plants in the Tahoe Keys lagoons. September 23, 2015 Tahoe Keys Property Owners Association 13
IWMP Objectives Minimize spread of weeds to Lake Tahoe Enhance habitat for native plants and animals Restore recreational and commercial uses in the Keys Establish adaptive management using best available technologies, BMPs and quantifiable results Contribute to Tahoe Region reduction in greenhouse gases by minimize impacts of management on air quality. September 23, 2015 Tahoe Keys Property Owners Association 14
Examples of Control Methods Under Consideration Modified harvesting and monitoring techniques Prevention and Boat maintenance practices Diver assisted weed removal Bottom barrier placement (limited to 5 acres per year) September 23, 2015 Tahoe Keys Property Owners Association 15
Proposed Control Methods for the IWMP NOTE: Methods are to be integrated and tailored for use in specific sites Mechanical and Physical: > Improved fragment capture and removal from Harvesting >Strategic use of bottom barriers and diver hand/suction removal Cultural: >Storm water management/ reduction in nutrient inputs >Property owner yard, shoreline, and dock maintenance practices >Boat maintenance practices (Reduce transport of plants) >Prevention of new introductions Chemical >EPA-approved herbicide applications in selected sites (currently not permitted in Lake Tahoe) September 23, 2015 Tahoe Keys Property Owners Association 16
Summary The IWMP will reduce deleterious impacts of aquatic weeds. Public, private and agency stakeholders have participated- and will continue to provide input and extensive review. The IWMP is adaptive and relies on intensive monitoring for annual strategic actions. The IWMP incorporates proven, widely used technologies that are tailored to specific Keys Lagoon sites. September 23, 2015 Tahoe Keys Property Owners Association 18
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