2/3 full with the Spring rains to go, volunteer insects etc. have had since last Fall to start showing up - You'll probably be OK to stock all the forage species you are thinking about (If it was just FH, I'd say Full Speed Ahead!). If we have a drought year, it could be bad, but that's true all the time.
Read some threads in the stocking section, get some other views on initial stocking timing.
P.S. Muskrats are usually considered undesirable; muskrats burrowing into the dam are ALWAYS undesirable.