I believe that freshwater red algae is NOT toxic. The massive red algal blooms that sometimes form in the ocean to create "red tides" definitely ARE toxic.
However, I am not an algae expert.
Like you, I maintain one small pond for wildlife. When our local creek goes dry during a drought, that pond gets unbelievably heavy traffic.
In your case, I think you maintaining your two ponds as a water source for the critters is a noble project. There are many summers that get pretty dry out in your region. You might even consider expanding your pond system when you have some good opportunities.
P.S. You do live in a beautiful region. We have some friends we visit semi-nearby on Lake Pend Oreille. That area is awesome!
CORRECTION:
Please read Theo's post below. Apparently there are some freshwater red algae than can be toxic.
Last edited by FishinRod; 07/29/26 03:17 PM. Reason: Correction