Clark Spring looks like a slice of key-lime pie. Is it stagnant?

With the help of my map, I locate Clark Spring in a gulley along the dry creek not far from the junction of Long Ridge Road and Jackrabbit Lake Road.

This spring is really, really green; is it stagnant? Maybe I'd be better off getting some water from Jackrabbit Lake instead.

A number of yellowjackets buzz around to the left of the spring basin where a trickle of water is seeping out from underneath. For a moment I consider trying to filter water from that little underflow, which looks cleaner than the spring.