Hey RBB,
That's a tough, low resolution and small section of topo map with which to prepare a pond potential assessment. It appears that the land continues to fall off to the NE. This would indicate that a pretty large dam would be required to stop the run-off. But...once again...it is very difficult to judge.
Some of the best pond-able properties have a topo that contains a "bowl" within the parcel boundaries. This can also occur in a ravine that runs thru the property. The best and most "economical to build" pond properties are located at the very beginning of what eventually becomes a run-off creek. The top and widest part of the funnel, if you will.
I used this method to find our pond property