Back in the seventies, my friends and I climbed a half dozen lines on That Dam Rock. I don't know if it still goes by that name, but this rock is on the Minnesota side, just below the dam that is upstream from the bridge. It sits out as an island of rock, well into the riverbed.
When we first climbed on this rock, we were pulling off loose stuff with every move and it appeared that we were doing new lines.
Nothing had been published on this rock and I moved to Colorado back in 82, where I no longer am privy to the goings on at TF.
Can anyone add any information about That Dam Rock?
Does it still go by that name? Has anyone else climbed on this formation? Has it finally cleaned up into some nice lines?

Tom,

I learned to climb at TF in 1968 with the Rovers. When were you there?
I posted some pictures of climbing in the Pot Holes area.
Here is one of me aid climbing just before the state trooper showed up.

Hi Greg,

I believe we may have had some dialog along these lines previously on MountainProject.
I started climbing at TF back in about 1971 at the ripe old age of twelve years old.
My early forays were sporadic until about 1976 or 77, when I became a weekend regular, with the occasional trip to Devils Lake, until 1982, when I moved to Colorado.
I knew Rod Johnson, but from Midwest Mountaineering, not so much TF.
I also knew Pat Padden, but I was more familiar with Jan Ebelhoft (sp?).
My usual crew included my brother Rob and Doug Gow, but I often ran into and climbed with Bruce Christopherson, Curt Lee, Dan Grady, Scott Backes and Mike Erikson.
It is strange that Twin City climbers have explored downriver, where they developed Franconia Follies, etc. But, to date, I have not heard of anyone other than my buddies and I climbing on That Dam Rock.

This is more a trip down nostalgia lane than an answer to your question. I learned to climb at TF in 76. Tori Stempf, Connie Hilliard, and Bob McGow were the instructors for a day trip. Later that year I did 3 days at TF 4 days at D. Lake then seven days in the Black Hills that culminated in an ascent of Devil's Tower. That trip was lead by Tori and Bob. My folks could not afford the cost of the trip so I got a "scholarship." At the end of the trip I was asked to send a thankyou note to Tori's dad. What a gift. Every weekend after that I would hitchhike up to TF and climb. Like the kids of today I would drink too many Mtn. Dews and hitch belays on any rope I could find. People were great and always let me join them. Eventually I got some friends involved and had partners. I remember that at the end of every day we would go over to Slick Sides and boulder it as a final work out. Eventually we could start on the thing to the left and down climb SS then reverse it.

Later I started leading courses with Tori. He would set me up with one or two of the best climbers and I would take them up the Redgarden Wall and get them tired out, then I could climb the rest of the day with locals or just solo stuff on the Wind Tower. $25 a day plus food and a tent. What a deal. Those guys were my mentors and I can't thank them enough for this lifestyle they showed me. Still at it 32 years later.