First off, this trail can be a bit of a bugger to find, so directions.
Headed westbound on Highway 26 from Colfax, you will cross over the bridge over the Palouse River. West River Road is immediately on the other side of the bridge, on the right. Turn here. Follow that gravel track as it winds through the industrial zone, past the rock plant. Along the way, you'll pass a stick with a faded cone perched on it. You're on the right path. Follow the road as it turns into a dirt track until you reach a green gate. Easy, if you know where to make the first turn.
Now the trail.
I saw the bald eagles again while I ran, along with a blue heron. The heron was at the beginning part of the Colfax Rail Trail. The eagle was in the first copse of trees on the return trip. Couldn't have been more than ten yards away and thoroughly magnificent.
From the droppings, elk are frequent visitors though I only saw a pair of mule deer and a herd of cows.
I think I spent more time fording the river (don't try this trick in spring or we'll have to retrieve your body from Palouse Falls!) and exploring the tunnel than I did running. Fun way to spend an afternoon.