Mr. Wright, I just Googled "CSS Calhoun" and you are right. It is the CSS Calhoun. Even the Navy History website has that same pic posted and identified as the Calhoun. While I am sorry this isn't an image of the Oregon I of course am happy you got to the truth.
Why the Oregon SCV identified it as the Oregon I can't say but I will let them know of the mistake. Thanks again for clearing this up for me.