A simple method to determine the traffic pattern altitude is to read it directly from the Airport Facilities Directory. Here you can see the Traffic Pattern Altitude (TPA) is 6885 or 1000 feet above field elevation as indicated by the parentheses.
You can search the Federal Aviation Administration (FAA) Airport Facility Directory here.
1. “What is the difference between Above Ground Level and Above Field Elevation?” by CARLVALERI on JANUARY 8, 2014
2. “Airport/Facility Directory” by the Federal Aviation Administration.