April
High country
Terrestrials uncommon. Deleatidium hatches common, as well as mature larvae. Net building caddis increasing in size and becoming more abundant. Horn caddis, on average, very small in size.
Low country
Large hatches Deleatidium mayflies in the smaller species common. Deleatidium nymphs common and are mature (large and dark). Horn caddis small, but sandy cased caddis still an important food source. Net building caddis becoming more abundant.