Everyone was not relocated from Washington Park. It all depends on where your relative was buried. The cemetery did crossed Highway 70 and the graves on that side of the highway were relocated. The cemetery on the Natural Bridge side, there are still graves there. The last owner of the cemetery was in some trouble regarding how her records were kept and were people were buried. Sorry to say, she committed sucide. The cemetery is located in St. Louis County of Berkeley. You might want to contact someone at city hall to see who has the records of the people buried there or the new owner.
Berkeley City Hall phone number is (314)524-3313