Two resources are available for the Mission. Repeaterbook and Rfinder are online resources with Android and IOS applications. The latter has replaced the ARRL Repeater directory.
BOTH rely on local users to let them know changes in the repeaters in the area. The former uses area administrators to oversee the process but they don't do all the work. The real work comes from reports from users like you.
Repeaterbook can always use administrators. For example, if you are in the Tulsa, OKC, Guymon, Lawton, McAlester, Durant area, volunteer to be an admin. There's no cost but your time and the value is immense.
In the mean time, summer travelers need to know what is available. The next step is to have someone listening when the call comes over the air.