As noted above I highly recommend you contact the local NRCS office and find out if they can design the pond for you. I believe this is the office:
https://offices.sc.egov.usda.gov/locator...29&cnty=183

Not all counties in MO can do it, but mine came out and surveyed the land, flagged it, designed it, and gave me drawings to hand to a contractor (although we did it ourselves). MO is pretty easy going on regulations on small ponds - no permits required - at least in my county. Dam height over 21 feet required the regional NRCS engineer to look it over. Dam heights over 35 feet in MO step off into the deep end of regulations and permitting.

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