Even though I'm a dealer and I have been told by friends that I may loose current and future customers when I post comments that can be construed as argumentative, etc., that's a choice I'm willing to take. This sport is awesome we're here to try to give accurate info. The big picture here Keith is that your safety and others safety and keeping riders ALIVE is something that we all take very seriously. I'm sure you do also, but you might want to reconsider this location.
Here's my take:
1) Listen to West.
2) Listen to Bryce.
3) Listen to Mario.
4) That field is SMALL (Tiny). Not huge at all. Sorry, but I've been riding for 13 years and it's the size of a pond. We don't typically ride ponds due to gusty winds and close obstacles. Can it be done? Yes, but the risks are great with power lines so close.
5) According to Google maps, the only direction that looks decent is straight south. However, across the road are 2 story houses and trees that are even higher, so the winds will be gusty even in this direction.
6) Any other wind direction is going to bring the lines into play quickly especially on snow. Snow conditions and texture change daily. Last week we had light snow on top of harder snow. It was fast. Then, it got warm and the top surface has a crusty layer that begs to be ridden really fast in order to break through the layer. In the winter, riding speeds are faster than the water so we cover greater distances in a shorter time frame. This just makes that field even smaller yet.
7) Do you have prior approval to ride there? Every field needs to have approval for riding or you are playing with fire. If not, you'll want to contact the school and they can give you the proper contacts for riding there. Whoever owns the park will be the contact person.
See #7 above.
9) Good luck riding and it's worth the effort to travel a little further to find safer locations.