When you first get the soil map click on that soil type and it will give you more info.
I looked up that soil type and it said that the soil soaks up the water which will give you less runoff but there is clay present.
Okay...so I looked through some more things on this site (again...very cool site...thanks for the link), and according to this site...
Soil conditions here are quite favorable to pond excavation, with the only limiting factor being the slope (e.g., I guess not adequate run-off). However, this site also states that this piece of land has no risk of flooding (not in the 500-yr flood plain).
This area is also fairly eroded, which would seem to make it easier to get help from the State of Missouri for financial / engineering support in construction (erosion control and all)
Given the stream behind this proposed site for drainage below the dam, the biggest limiting factor seems to be...WATER.
Hmmmm...now how do I find out about the feasibility of digging a well on this site to keep water in the pond???? Thinking...thinking...