Thanks Tim for replying.
I think the spring you are referring to is about 1/2 mile from Vivian Creek Camp junction sign which usually flows all year.
There is a unreliable water source near Halfway Camp. It is just before the Halfway Camp junction sign and off trail in the dry creek bed. It doesn’t usually last through summer and can be hard to find. Sometimes you have to listen carefully for tickling water to find it.
Here is a map:
