March
High country
Terrestrials still abundant (if weather is still warm). Some Deleatidium species starting to hatch (D lillii and D vernale). Cased caddis still abundant, but many species will be smaller in average size, especially stone cased and horn cased caddis. Free living green caddis becoming less common.
Low country
Deleatidium nymphs common, and mature. Hatches are starting, mostly the smaller species (8-9mm). Sandy cased caddis larvae still present, and horn caddis, but these are generally smaller in size. Willow grub feeding generally over. Few free living caddis. Caddis hatches generally over.