I don't think the members of the reservations are suckers in the way the council thinks you are. The reservation asked that the road be improved so they have something to gain. In your case you don't give a rat's patootie if they improve the road, you are happy enough with your current access.There is a reservation at the east end of my property. One of the band members approached the county about building up this easement in order to gain access to the reservation. The county again said no. So now, they've got 2 unsuspecting suckers that they can get to build it for them (in their eyes anyway).
Probably a lot more than you have to deposit unless you just robbed a bank or printed a lot of money in the basementAnybody know if there's a limit to how much money you can deposit at once?

Actually I don't know but for some reason $5K in cash comes to mind as the point where they start getting nervous. If it is a check it could be any amount. Of course they have a hold on most the the amount of a big check until it clears, they don't want to be on the losing end of a bad check.