As of 6 p.m. ET on Sunday, state officials had confirmed at least 78 deaths in Texas and acknowledged there were 10 girls missing from Camp Mystic along the Guadalupe River.
A wall of water swept over the area after heavy rainfall saw the Guadalupe River rise 26 feet in less than an hour early Friday morning.
"Our hearts are heavy as we witness the devastation and loss of life caused by the floods in Kerr County and Texas Hill Country, especially for the young girls and their families, as well as all of those lost and their loved ones," the Cowboys said in a statement.
"This has been devastating to see and we hold everyone impacted in our thoughts and prayers. Standing side by side with The Salvation Army's critical response, we are also donating $500,000 to provide immediate resources for rescue, relief and long term recovery efforts."
Camp Mystic, in the community of Hunt in Kerr County, is a Christian girls' camp that opened in 1926.