My suggestion to anybody seeding a dam or any other highly erosible soil is to fertilize, lightly work up the soil, over seed and put something that is fast to germinate like wheat of annual rye grass with a good perennial mix, roll, straw, if you�re not get any rain water it (I ran 150' worth of extension cord to 1/2 hp sump pump with a 1 1/2 take off to my pond. If you don't have power get a gas power pump. Then run a sprinkler system using several of the cheap rotating sprinklers with spikes you stick in the ground.), and give it a good soaking three times a week. When you get some good germination fertilize again and if it starts to wash straw and straw again.
That�s the least I would do. Last weekend on the � acre area I just posted about I put 250 lb of Triple 19, 200 lb of winter wheat, 150 of grass seed, put up a 100� silt fence around the pond and another 125� half way up the hill, strawed heavily, and then I stapled down five 8x112� straw and nylon erosion rolls out over the straw. The only reason I didn't do more was because I couldn�t think of anything else.