A fire destroyed ten apartments near Durango and damaged up to five others early Friday morning.
A firefighter suffered a dislocated thumb but no injuries to residents were reported.
La Plata County sheriff's spokesman Dan Bender says firefighters were hampered by low water pressure and the lack of a sprinkler system in the apartments. He says the complex was built before sprinklers were required.
Bender says 20 residents were evacuated but some had been allowed to return. At least ten people took refuge at a shelter set up by the Red Cross.
The fire began in a third floor apartment.
Bender says investigators believe it may have started when a resident fell asleep while food was cooking on his stove.