Squaretail,
To my knowledge, all stoneflies crawl out of the water to hatch. What you may be witnessing on the water is egg laying process of adults after hatching
Here is info I looked up on "Troutnut", with a link to the site. Good luck!
"Hatching Behavior
Stoneflies owe their unimportance to their emergence style, which keeps them safe from trout at a stage when mayflies and caddisflies are the most vulnerable. Without exception, they emerge by crawling out of the water onto rocks, sticks, or other shoreline objects. In some species the adult emerges from the nymph within inches of the water, and others crawl up to ten feet back into the woods, but this distinction matters little to the trout.
After emerging, the adults may live for up to a month. Like caddisflies and unlike mayflies, many stonefly species can eat and drink as adults.
Egg-Laying Behavior
Stonefly adults are usually only important when laying their eggs after mating. Some drop their eggs from above the water but many either flutter along the surface or land on the water and create a commotion capable of drawing savage strikes from large trout during midday. They are one reason for the success of the Stimulator dry fly in large sizes.
Stoneflies may fall spent (Spent: The wing position of many aquatic insects when they fall on the water after mating. The wings of both sides lay flat on the water. The word may be used to describe insects with their wings in that position, as well as the position itself.) after ovipositing."
http://www.troutnut.com/hatch/13/Insect-Plecoptera-Stoneflies