How do I pay a 3Rivers loan/credit card/mortgage/line of credit? Log in and select the “Transfers” tab. Select the accounts you wish to pay from and pay to in order to initiate the payment. Have more questions? Submit a request 0 Comments Article is closed for comments. Related articles Where do I send Mastercard credit card payments? My payment doesn’t seem to have posted correctly. What do I do? What is 3Rivers routing number? I forgot my user name. How do I retrieve it? Why is my 3Rivers debit or credit card being declined?