From a Nixle Alert issued by the Mendocino County Sheriffs Office:
There are 628 Frontier landline phone customers in Covelo, CA who are currently without phone services. It is unknown what caused this outage at this time or how long it will take to reinstate phone service to these customers. These customers will be unable to use their landline phones at all during this outage. If you are experiencing difficulties in reaching someone in Covelo who has a landline phone, please understand it is possibly related to this phone outage. Additional information will be released as it becomes available.