BUFFALO, NY -- The recent meltdown of the extensive snow pack, combined with rain, has caused significant rises in many creeks and rivers in Western New York.

WATCH: Drone footage of Buffalo Creek

A Flood Warning remains in effect for the Allegheny River in Olean until Monday morning. As of 8 a.m. Sunday, the river was at 11.4 feet and slowly falling. Flood stage is 10 feet. The river is expected to drop below flood stage early Monday morning.

A Flood Warning is also in effect for Oatka Creek until Sunday evening. As of 8 a.m. Sunday, the creek was at six feet and falling. Flood stage is six feet.

A Flood Warning is also in effect for a stretch of Tonawanda Creek along the Niagara and Erie County border, extending into western Genesee County. Tonawanda Creek has been slowly rising this weekend and is expected to crest near flood stage late Sunday night. Flood waters will recede Monday,

The Red Cross opened a shelter at the Winchester Elementary School (650 Harlem Rd.) for any Buffalo residents forced to evacuate, or without utilities, due to flooding.

PHOTOS: Flooding in WNY