The Island is a small, uninhabited island in Cheesman Reservoir in Douglas County, Colorado, United States. It lies within the Pike National Forest between Denver and Colorado Springs.
Geography The Island is in the upper part of the reservoir. It is about long and wide, with a vegetated area of roughly (). The highest point reaches about above sea level, while the reservoir surface is as high as about , giving the island ~ of local relief. Some datasets report an elevation of for the feature. At low water the island can be connected to the shore by a narrow bar.
Geology Like much of the surrounding region, the island is composed of coarse Pikes Peak granite. Vegetation consists of scattered shrubs and trees.
Administration The county line between Douglas County (east) and Jefferson County (west) runs along the middle of the reservoir; The Island lies off the eastern shore and is therefore part of Douglas County.
Reservoir setting Cheesman Reservoir trends roughly north–south for about with a maximum width of about ; the water surface can reach an elevation near . The reservoir lies within Pike National Forest, which covers about across Clear Creek, Teller, Park, Jefferson, El Paso and Douglas counties.
Climate Based on global datasets, the broader area has a cool, semi-arid climate by the Köppen climate classification. Mean annual temperature is ~; the warmest month is July (~) and the coldest is February (~). Mean annual precipitation is about ; September is the wettest month (~) and November the driest (~).
2002 Hayman Fire In June 2002, the Hayman Fire burned roughly of the Pike National Forest (well over ten percent of the forest's area). It is unclear whether the fire affected The Island directly.
See also List of islands of Colorado
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