How to buy worthless abandoned property from the county

[Wade G.]

This is an odd question about buying worthless rural property but I want to do it.  Situation is I have rural property along a river that floods half the year.  The unimproved lots near me mostly have owners that died many years ago and likely did not have wills.  The county will not foreclose on the properties because the legal fees will cost more than they will ever make on taxes since the lots are taxed at about one dollar a year.  So I can't contact the owners and the county won't foreclose.  Am I missing something, is there no way to acquire these lots?  I talked to an attorney about adverse possession but he said it is very difficult in Texas.