Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.
Grasshoppers and crickets are terrestrial insects--the only part of their life cycle spent in the water is the "oops" stage. Grasshoppers are most important to the trout, but crickets may fall into streams as well.