Providence Health warned state officials Monday that a looming strike involving thousands of nurses and physicians across multiple facilities will create a "significant risk" for health care in Oregon.

Renton, Wash.-based Providence received a strike notice on Dec. 30 from the ONA, which represents nearly 5,000 workers across eight hospitals and six clinics, including physicians, nurses and nurse practitioners. The union has called for an open-ended strike starting Jan. 10 involving 11 Providence bargaining units.