The women were identified as 22-year-old Jessica Jackman and 29-year-old Valerie Rae Bradshaw, both of Sandy, Utah.
A 57-year-old woman was confirmed dead in the crash, though her name has not been released.
The three women were among 13 people, including seven adults and six children, on board the motorboat when it crashed against a houseboat. No passengers on board the houseboat were injured.
Rescue teams used SONAR equipment Sunday in their search for the missing women.
"This is what they do," Kane County Sheriff's Sgt. Alan Alldredge said of the dive teams. "They’re really good at it, they’ll keep looking and they don’t generally give up. They’ll keep looking until they find them."