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(Excerpt from "1994 Statewide Water Quality Assessment Report-Lakes Chapter" by J. Rector and D. Hallock.)
Application of aquatic herbicides is a common method used to control aquatic plants in Washington. Aquatic herbicides approved for use in Washington State lakes are glyphosphate (trade name Rodeo®), fluridone (Sonar®), and endothall (Aquatholl K®). Copper compounds are sometimes allowed for algae control, and 2,4-D is allowed under certain conditions to control purple loosestrife. Aquatic herbicide use requires a short-term modification to the state Water Quality Standards (Chapter 173-201 WAC), issued by regional offices of the Department of Ecology. Short-term modifications to the water quality standards are also required for mosquito control projects and fishery enhancement projects that involve the use of rotenone. A short term modification of water quality standards cannot be issued if the proposed action interferes with or becomes injurious to existing water uses or causes long-term harm to the environment.
In 1993, short-term modifications were issued and aquatic herbicides were legally applied at 71 lakes or ponds. Twenty-five permits were for treating shorelines with Rodeo® to control infestations of noxious plants (mostly, Purple loosestrife). Three lakes were treated with rotenone by the Department of Wildlife to control undesirable fish species (such as goldfish). The remaining 43 lakes were treated with aquatic herbicides to control algae, submerged aquatic plants, and/or floating-leaved aquatic plants. Twenty of these 43 lakes are privately-owned, and therefore are ineligible for state or Federal funding for lake assessment and restoration activities. Limited technical assistance may be provided by Ecology's educational programs, but otherwise it is likely that aquatic herbicides will continue to be the prevalent method for managing aquatic plants at private lakes.
Lakes treated with aquatic herbicides in 1993. Source of information: 1993 Spray reports to Ecology from licensed herbicide applicators ________________________________________________________________________ Lake (County) Chemical Target ________________________________________________________________________ Anderson (Mason) Komeen®, Rodeo® elodea, cattails Aqua Vista (King) Copper, Sonar® algae, pondweeds Barnes (Thurston) Rodeo® water lilies Battlepoint (Kitsap) Sonar® pondweeds Blue (Thurston) Aquatholl® milfoil Bonney (Pierce) Rodeo®, Sonar® water lilies Cherry Pond (Snohomish) Copper algae Clear (Thurston) Aquatholl®, Copper milfoil, algae, pondweeds, elodea Debra Jane (Pierce) Aquatholl® (not reported) Elbow (Thurston) Copper algae Fawn (Mason) Copper, Aquatholl® algae, pondweeds Forbes Creek Development (King) Copper, Sonar® algae, pondweeds Fountain Isle Lake (King) Aquatholl®, Copper pondweeds Gig Harbor, Lakes at (Pierce) Rodeo® lilies Gravelly (Pierce) Copper, Aquatholl® algae, pondweeds, swimmers itch Jeane (King) Copper, Sonar® algae, pondweeds Ken (Thurston) Aquatholl®, Rodeo® pondweeds, cattails Ketchum (Snohomish) Aquatholl®, Copper algae, pondweeds Killarney (King) Copper, Sonar® algae, pondweeds Kent, Lakes at (King) Copper algae Lakeland Village (Pierce) Aquatholl® (not reported) Leisure Time Pond (Lewis) Aquatholl® pondweeds Limerick (Mason) Copper, Sonar® algae, pondweeds, elodea Louise (Pierce) Copper algae, swimmers itch Lorene (King) Copper, Sonar® (not reported) Mayfield (Lewis) Sonar® elodea Mercer Island, Lakes at (King) Copper, Sonar® algae, pondweeds Minterwood (Pierce) Sonar® elodea Ohop (Pierce) Aquatholl® pondweeds Palmer (Pierce) Aquatholl®, Copper pondweeds, algae Pioneer Trails Sonar®, Rodeo®, pondweeds, cattails, algae Copper Ponce de Leon (King) Copper, Sonar® (not reported) Reflection Sonar® Elodea Sixty-01 Lakes Rodeo® (not reported) Star (Mason) Sonar®, Rodeo® pondweeds, lily pads Swofford Pond (Lewis) Sonar® Eurasian milfoil Sylvia (Pierce) Copper algae Small Timber (Mason) Aquatholl® pondweeds Big Timber (Mason) Sonar®, Aquatholl®, lily pads Rodeo® Wallace Pond Sonar® milfoil Washington -- at Newport Shores Aquatholl®, Sonar® milfoil Westridege Ponds Sonar® milfoil Weyerhaeuser Ponds Copper algae, elodea ________________________________________________________________________ Shorelines treated with fluridone (Sonar®) to control Purple loosestrife (unless otherwise indicated) ________________________________________________________________________ Burke (Grant) Ione Mill (Pend Oreille) Caliche (Grant) Long (Spokane) Canal Lake Long Lake (Grant) Loon (Spokane) Capitol (Thurston) Quincy (Grant) Upper Clark Pond (Franklin) Red Rock (Yakima) Corral (Grant) Royal City Lakes (aka Clementine) Crater (Grant) (thistle and knapweed) Skagit Wetlands Evergreen (Grant) Stan Coffin (Grant) Fan (Pend Oreille) Terrell (Whatcom) George and Martha (Grant) Warden Lower Goose Lake (Grant) Winchester Upper Goose Lake (Grant) Winderemere (reed canary grass) Hilltop (Grant) ________________________________________________________________________ Lakes Treated with Rotenone to Control Undesirable Fish Species ________________________________________________________________________ Burke (Grant) West Medical (Spokane) Quincy (Grant) ________________________________________________________________________
Please report errors to Dave Hallock.
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