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This should qualify as foraging and DIY.

Yeah, apparently there is. I was going by Idaho's Fish and Game guidebook which says there are none in the state. https://idfg.idaho.gov/species/taxa/2011420 Incidentally, your map shows none in Montana. Apparently they have two species of Anafroptilum...

The id of the mayfly as Paraleptophlebia is incorrect because Paraleptophlebia has three tails as an adult not two as shown in the photo. The photo doesen't appear to show one broken off either. My guess is Baetidae, possibly an Anafroptilum species. Idaho doesn't list any Anafroptilum species...

Charlie Musselwhites version of Christo Redemptor

This nymph is found in Mill Creek (tributary to the Russian River) from late summer to early winter. The nymphs are found under gravel and cobble with leaves (primarily white alder) mixed in. Average size is about 7 mm (excluding antennae and cerci).

This dragonfly nymph is found in backwaters. This one was collected from the Russian River in August. They're in the river in the late summer and early fall months. It ranges in size from 11-15 mm.

A good way to differentiate between male and female is that the male has fairly long,plumose antennae, while the female usually has shorter unadorned antennae. It is thought that the male has the more ornate antennae in order to find the females for mating. https://bugguide.net/node/view/3163

This nymph is usually around most of the year and prefers a gravelly bottom in a fairly fast current. Size ranges from 6-7 mm. These were collected in the mainstem of the Russian River. Female Female Male Male