Craneflies begin showing up on spring creeks around February 15th. As the season becomes warmer, their intensity increases, with the greatest intensity in midsummer.
Crane flies, like midges, are diptera. The most common Tipula borali. These bugs are yellow or orange when they hatch, but by the time they come down to rest on deadfall they turn gray
Look for swarms resting on partially submerged deadfall.