caddis

American Grannom		Brachycentrus occidentalis / Brachycentrus americanus
		Grannom larvae build rectangular, tapered cases, prefer moderate to fast riffles and runs and emerge midstream. Occidentalis is the first important Caddis emergence of the year, beginning in the last week or two of April and continuing through June. Peak emergence usually occurs from the last week of April until the last week of May. The first few weeks can produce incredible numbers of adults. Americanus begins to emerge in July and continues through August. The emergence is much smaller than occidentalis, but is a significant hatch on the Yakima.

occidentalis: Size: 16 to 18 Color: wings: tan. body: dark olive to black with an olive lateral line on the abdomen. americanus: size: 14 to 16 Color: wings: brown. body: brown. Emergers: dark brown and olive.

Spotted Sedge

Hydropsyche

These case-less caddis build small nets to seine food from the current, prefer moderate to fast riffles and runs and emerge midstream. Hydropsyche can begin emerging in spring, generally during the afternoon, but the heaviest emergences usually occur in July and August in the evening.

Larva: Size: 14 to 18 Color: light olive brown to dark olive brown. Adult: Size: 14 to 18 Color: wings: tan. body: tan to light brown. Emerger: brown and golden tan or dark dun and dark golden brown.

Little Sister Sedge	Cheumatopsyche
	These case-less caddis build small nets to seine food from the current, prefer moderate to fast riffles and runs and emerge midstream. Cheumatopsyche are active from April to August and are mostly daytime emergers on the Yakima.