You would need to install some sort of bypass system for times of heavy flow. During heavy storms the flow into the pond should be very limited.
For a one acre pond in the Ozarks, about 10 acres of watershed is all that is needed. 150 acres will definitely wash out your dam within a few years, or at least fill your pond with silt.
My neighbor has 1.5, 4, and 7 acre ponds in a chain on about a 400 acre watershed by the time it reaches the lower end, and has had major washout and silting problems that simply cannot be fixed without spending many many thousands of dollars.
