The men, both in their 40s, were riding in a 23-foot ski boat when they apparently crashed into the Bethel Island levee, Coast Guard Petty Officer Danielle Couture said.
Both were ejected into the water at about 5 a.m., and rescued about 45 minutes later, Couture said. The boat sunk.
The men were sent to a nearby hospital, Couture said. One was experiencing hypothermia and the other hurt his leg, she said.