This is the power line behind my house
Maybe you folks can guess at the size http://members.aol.com/gfretwell/powerline.jpg

I have heard 125kv and 250kv for the top set but I don't know for sure. The posts are about 90-100' high. My boathouse is technically in the right of way but it is over submerged lands so it is state controlled.

Greg Fretwell