Payments can be mailed to PO Box 722, Estes Park, CO 80517 or dropped off at 1201 GRAVES AVENUE. We have a convenient payment drop box on site. A very popular payment method involves setting up an automatic payment through ACH. ACH payment is a simple and free method of paying your bill. A copy of the ACH form is available on forms tab or you can fill in the information from the Home Page in the update ACH section.