Re: Denver and 200 mile radius in May
contact one of the local shops near where you will be. Get the misc stuff you will need.
Lakes and tail waters would be the best bet.
this page has links to many of the local fly shops. Look at their websites and fishing reports.
West Denver Trout Unlimited (WDTU) Colorado Fly Fishing News
Don't forget to clean your equipment that contacts the water before moving to another body of water.
clean, inspect, dry !
disinfect your wading equipment. wash boat. disinfect livewells / sumps, wash ur dog