I used to use jully 4th as a rule for a couple over here in the olympics.If I remember right Mildred lks. sits around 5000,I could be wrong though.Anyways I used to catch the fish spawning in the creek.It was an amazing sight.It kind of depends on the amount of snow versus exposure and weather.

The rangers in charge of the erea can give you a real time picture dependant on the reports of the people that have already hiked up there.Give them a call.They are a wealth of info to the back country.