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Range of short‑ and long‑term fixes proposed for Weiser Lake; consultants present sediment capping, aeration and watershed actions
Summary
Consultants presented a suite of management options for Weiser Lake — from in‑lake chemical sequestration and aeration to watershed septic and agricultural measures — and emphasized tradeoffs, costs and the need for further monitoring to choose the right combination.
Consultants to Whatcom County outlined a menu of management options for Weiser Lake that combine short‑term treatments and longer‑term watershed actions, but they stressed that additional monitoring is needed to select the right measures and scale.
“Short‑term” lake interventions presented included: phosphorus sequestration (chemical treatments commonly called alum or lanthanum applications), periodic water‑column “stripping” to remove algal biomass, and localized algaecide applications for high‑use areas. Consultants also described aeration — bottom diffusers with shore compressors to mix the water column — as a possible option where nocturnal anoxia is confirmed. Fish removal and goose deterrence were mentioned but not recommended as sole fixes.
Consultants distinguished two treatment modes: lighter annual “stripping” doses applied to bind and remove phosphorus in the water…
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