I see I'm over five years late - but hopefully better than never!

The version I remember included these verses:

Hurry up, old Pioneer, keep movin'
Your faithful little band must never fail
'Cross the Great Divide, side by side we'll ride
Down the Oregon Trail

There'll be apples on each branch in Oregon
There'll be valleys filled with golden grain
There'll be cattle on each ranch in Oregon
For there'll be plenty of sun and rain

I think this was a version for chorus and piano, which we sang in elementary school music class, in the mid-60's.