Sudden Valley Sprayed Lake Louise's Water Lilies Last Month. They're Not Actually Gone.

"This lake is weird." That's how Thomas Riley describes Lake Louise after years of fishing it several times a week, sometimes twice a day. Riley goes for largemouth bass, occasionally pulling up a yellow perch or bluegill, and he's learned to read a lake that doesn't behave the way it should. Some days he lands a four or five pound bass. Other days, a six-incher. He blames the water lilies, at least partly, for how hard the lake has become to read. They cover so much of the surface near the bird sanctuary that he can watch bait jump and a fish leap and still lose the whole moment under a mat of pads.

If you live in Sudden Valley, you've probably watched the same lake go through the same fight this summer. On August 27, a crew from AquaTechnex spent a full day on Lake Louise spraying herbicide across the invasive fragrant water lilies that have colonized much of its shoreline. If you assumed that was the fix, the reporting on what actually happened, and what's happened before, tells a different story. This isn't a problem Sudden Valley solved in August. It's a problem the community is now managing on a schedule, the same way you'd manage blackberries along a fence line, except this fence line touches Bellingham's drinking water supply.

What's Actually Growing in That Lake

Fragrant water lily looks harmless in isolation, a lily pad with a showy white flower. The trouble is scale. When it spreads across acres of shallow water, it blocks sunlight and oxygen from reaching what's below, chokes off open water for boating and fishing, and crowds out native plants that fish and waterfowl actually depend on. A 2025 study from researchers connected to the Lake Whatcom Quality Team at Western Washington University found that the lily mats roughly double the amount of dissolved organic matter in Lake Louise over the summer months. When the plants die back in fall, that organic load settles into the lake bed as a thick layer of rotting vegetation.

The stakes go beyond one lake's water quality. Water from Lake Louise flows through a spillway into Austin Creek, which is used to irrigate the Sudden Valley golf course along Lake Whatcom. And Lake Louise itself sits fewer than 2,850 feet from Lake Whatcom, which supplies Bellingham's drinking water. Every decision about what chemical to put in Lake Louise gets weighed against that proximity, which is exactly why the spraying became a community argument and not just a maintenance task.

Two Summers of Volunteers, Then a Different Plan

Before AquaTechnex ever showed up, Sudden Valley resident Bryan Burke spent two summers trying to solve this by hand. He waded in chest-deep in neoprene with a forked aquatic weed cutter, working alongside fellow resident Andre Dallaire, slicing water lily stalks and hauling the cut plants back to the Welcome Center in milk crates. It worked, in the sense that the cove near the Welcome Center is visibly less dense than it used to be. It didn't work at the scale the lake actually needs. Burke has estimated it would take something like 40 volunteers, once a week, from May through September, to make a real dent. Sudden Valley doesn't have that.

That gap between what volunteers can do and what the lake needs is why the community association started weighing other methods, and the price differences explain why hand-pulling lasted as long as it did before anyone reached for a sprayer.

Manual removal costs nothing but labor and doesn't scale. Mechanical harvesting scales but costs more than most communities are willing to spend on one lake. Chemical treatment landed in between, cheap enough to actually happen, but not without a fight over what exactly was going into the water.

The Argument the Association Had to Answer

A resident's letter to the editor in the Sudden Valley Views last November asked a direct question: had management checked with the Lake Whatcom Quality Team at Western Washington University before choosing a herbicide, given that Lake Louise's weir periodically opens to Austin Creek and dumps into Lake Whatcom? The association's response was that manual eradication of the water lilies was attempted for two summers with limited success, and that AquaTechnex is a professional aquatic management company with extensive Pacific Northwest experience.

There's also a discrepancy worth knowing about if you're trying to figure out exactly what went into the lake. The community association's own communications identified the product as Imazamox-based. More recent reporting on the August spraying described the herbicide as containing glyphosate. Both are systemic herbicides commonly used against water lily, and it's possible the full product includes both active ingredients, but the two accounts don't quite match, and neither has been fully reconciled in what's been published so far.

AquaTechnex, for its part, has said very little of the herbicide actually reaches the water when it's applied directly to lily pads, and what does make it in breaks down over time through microbial activity and sunlight exposure. Burke, who's spent two summers doing this the hard way, isn't fully sold on herbicides even so, citing the track record of chemical companies more broadly. His view, in his own words, sums up why nobody in Sudden Valley expects this to be the last chapter: "You never fully get rid of them unless you want a sterile lake."

What to Expect on the Water This Fall

The lilies will start dying back as the weather cools, which is normal, but it's also when the real mess shows up. As the plants decompose, they add to that thick layer of organic detritus on the lake bed, and their rhizomes, the underground stems that let the plant come back year after year, sit dormant through winter before sending up a new crop in spring. That's the mechanical reason a single spraying in August doesn't end the story. The rhizomes were never the target. The surface growth was.

If you're out at the bird sanctuary end of the lake or paddling past the Welcome Center this fall, expect visible dieback rather than a clean lake. If you fish Lake Louise the way Thomas Riley does, don't expect this year's spraying to change the bass fishing overnight, since the mat that made casting difficult through summer will simply rot in place before regrowing next spring. And if you're the type who reads the Sudden Valley Views newsletter or shows up to community meetings, keep an eye out for whether the association treats this as a one-time August event or commits to a multi-year plan, because a single application at this scale rarely finishes the job on a plant that spreads by rhizome and by seed carried on the feet of waterfowl.

None of this makes Sudden Valley's lake problem unusual. Lake communities across the region, including Cottage Lake in King County, have fought fragrant water lily for years without a clean win. What makes it worth understanding if you live here is that this isn't a solved problem you can stop paying attention to. It's a seasonal one, and next August you'll probably be reading about it again.

If you're weighing a move within Sudden Valley, whether that's downsizing along the lake or looking at a different gate altogether, this is the kind of neighborhood detail that doesn't show up on a listing sheet but shapes how the community actually runs. Christine Cicchitti has been working Whatcom County long enough to know which local questions are worth asking before you buy. Call or email Christine for a free local market consult and personalized next steps.