lost email/password for ADMIN!

I am a volunteer for a nonprofit organization, called Priest River Ministries. Our website, prmafw.org, is hosted using WordPress (not sure the version,) and I am having an awful dilemma… The volunteers before me have left no record of what e-mail they used to sign up as the WordPress admin for our website, and for some reason the password has been changed and I can no longer log in with the known username/password that I have done so with before.
I have NO IDEA why, but now I cannot log in at all, and I cannot “recover password” because the password recovery is not sent to the e-mail we now use for our nonprofit communcation…something I didn’t know. Unfortunately there is no record of what e-mail was used to sign up with it, and I have exhausted all my detective skills in trying to track it down…to no avail… The last thing I can possibly do is contact you, WordPress, to help me with this. 🙁 I do NOT want the organization to lose the whole website just because of this. Please help!!!