I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.
This is one of the most common Rhyacophila species in the East and Midwest, and it was reported by the Leonards as the most common in the Lower Peninsula of Michigan.
In 14 records from GBIF, adults of this species have been collected during May (57%) and June (43%).