More than 50 people were injured when the deck gave way following a memorial service for a firefighter who died in April.
Firefighters say the cause of Saturday afternoon's collapse is still under investigation, but there were more than 25 people on the deck at the time.
At least six people were taken to area hospitals by helicopter and the rest were transported by ambulance.
Witnesses to the collapse told ABC FOX Montana one side of the deck was spongy, and that once it collapsed it was a domino effect.
"Our operating room was busy all night", spokeswoman Allison Meilicke told the Missoulian.
Lake County Sheriff Don Bell says his department won't investigate the collapse because there wasn't a crime.
Police Officer That Murdered Philando Castile Found 'Not Guilty — Not Surprising
Slave patrols were common in southern U.S. states where white men would monitor and enforce discipline on black slaves. Paul that ended in 18 arrests on I-94, Castile supporters gathered at Loring Park in Minneapolis at 5 p.m.
She walked away with bruises, but many of her friends and relatives were taken away in ambulances, she said.
The department says it doesn't believe the county has regulations on the maximum capacity of balconies or decks.
"Of the more than 50 people hurt, more than half of them were taken to Kalispell Regional Medical Center where doctors say many had bone and ankle fractures as well as neurological injuries that required immediate surgery".
"When I first got on scene I saw injured people", he told NBC Montana. Besides hosting a summer camp, it is a popular spot for religious retreats, weddings and other events.
Somers' Fire Department said the second story deck collapsed around 4 p.m. and fell a total distance of 15 to 20 feet. Please join us in praying for the injured and their families. First responders from both Flathead and Lake counties responded to the incident.