A recent visitor to the area was kind enought to post a great blog piece about their climb up Steamboat Rock.

Posting photos from significant stops along the route, you get to see how the climb looks before you decide to try it. (It’s pretty do-able for most folks, but it’s utterly without any services at the top).
I haven’t done this in a while, but it’s a worthwhile endeavor, especially is you’ve visited the Visitor Center at Grand Coulee Dam and understand how the Grand Coulee (the canyon, not the dam) was formed. It’s a jaw-dropper view from the top.

For a quick preview of it, see this couple’s great post.