Memory of San Luis Valley

Hi all -

Many years ago, in the mid-1950s, I was with a group driving through the San Luis Valley in Colorado.

I have a memory of a well-maintained highway entering a town there, with very beautiful mature trees lining both sides for a fairly considerable distance. At least half a mile?

Can anyone tell me which town that might have been?

If so, please write me at:

ewraven1@sympatico.ca

Many thanks,

Eleanor White
Elliot Lake, Ontario
Canada