DChap, do you have a way to water the grass now that you have water in the pond?
All of the over-seeding in the world won't help if a 2-week dry spell can kill off your new grass.
There are lots of different options for you to consider, depending upon your total square feet of grass to maintain, whether you have electricity at the site, etc.
No way to water grass out by the pond. I can run electricity from my house if I need it for now. I plan to run electric this summer.
