Specialty markets for small-diameter wood, especially black walnut, are extremely variable.
For example, pole-size red oak markets may include logs for shiitake mushroom production and firewood producers.
Whereas pole-size black walnut markets will likely be limited to custom sawmill operators, woodworkers, and wood turners.
Please contact your state forestry agency to determine local Wisconsin markets for these pole-size hardwoods.
WDNR Forestry:
http://dnr.wi.gov/topic/ForestLandowners/locator/