Kirk:

I think the Christian Camp trail is that one that went up the hill when we hiked down the river a ways.  We didn't go very far up the trail, though.

So coming from the east side should be possible still, but instead of going across the logjam you'd have to start at the end of the spur above the Memaloose tunnel and then if you cross the pipeline bridge you could get to the tunnels on the other side of the South Fork?  The "trail" from the end of the spur seems like it might be worse going down to the creek than coming back up because it's so steep.

Kirk Tolstrup said:

So coming from the east side should be possible still, but instead of going across the logjam you'd have to start at the end of the spur above the Memaloose tunnel and then if you cross the pipeline bridge you could get to the tunnels on the other side of the South Fork?  The "trail" from the end of the spur seems like it might be worse going down to the creek than coming back up because it's so steep.

That would be the other possibility.  That was actually the way I was going to go until Don and Charles showed me the better way.  Either that, or wading the river, but that wouldn't be too easy until September or so.  The other option is the "Christian Camp" trail, which is pretty rough I think, but should be doable after some more exploration.