Fort Rice, N.D. - The Morton County Police Department is still searching for 57-year-old Darvin Gratz.
Gratz has been missing since Thursday May 11th.
This week, Morton County has continued to search for him using aerially with highway patrol planes and have conducted ground searches.
Yesterday, the Stutsman County Sheriff's Department came in with additional sonar equipment.
The sonar had a few hits underwater, but dive teams were unable to find anything.
The family is organizing a search tomorrow.
They're asking people to join them near Fort Rice mainly to search the banks of the river.
They want the help while they are still in the time frame for body recovery, which is 10-15 days according to Morton County.
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