• As a vernal pool dries out at Turnbull National Wildlife Refuge, flowers bloom in concentric circles, following the receding shoreline. Photo © Douglas King
  • As a vernal pool dries out at Turnbull National Wildlife Refuge, flowers bloom in concentric circles, following the receding shoreline. Photo © Douglas King
  • As a vernal pool dries out at Turnbull National Wildlife Refuge, flowers bloom in concentric circles, following the receding shoreline. Photo © Douglas King
  • As a vernal pool dries out at Turnbull National Wildlife Refuge, flowers bloom in concentric circles, following the receding shoreline. Photo © Douglas King
  • Winter runoff caused a vernal pool to appear on Nature Conservancy property in eastern Washington in spring 2011. Photo © TNC.
  • Winter runoff caused this vernal pool to form on Nature Conservancy property in eastern Washington in spring 2011. Photo © TNC.
Washington Vernal Pools
In eastern Washington, winter runoff sometimes causes temporary pools of water known as "vernal pools" to appear.