I doubt that I would do it. You only have enough room for 40 to 50 ft of pond. The future pond would also, I assume, gets rain runoff.
And, if you back the water up over the spring, it could cause a problem if the ground water level ever drops. That's when springs start sucking water from the pond.
It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.
Without a sense of urgency, Nothing ever gets done.
Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP
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