Can someone give me a list of the reptiles in boulder city?

Boulder City is the area around Boulder Dam, Nevada. If you mean the City of Boulder, north of Denver, then I have found a few harmless lizards in the Flat Irons west of town. In remote desert fields, you may find a few garter snakes and little prairie rattlesnakes that tend to ociate with prairie dogs in areas like Denver International Airport. If you are concerned about living around poisonous snakes, then stick to urban areas or move above 10,000 feet in the mountains where the winters are too cold and long, oxygen too thin, to sustain poisonous snakes. If you have other issues, you need to provide more details in your inquiries. Up on hiking trails in the mountains, there are no dangerous animals other than a few friendly black bears, docile moose, shy elk, timid mule deer, and very reclusive garter snakes.