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How do you know if something is a lake or a reservoir on a topographic map?

I can't figure out if a body of water on a topographic map is a natural lake or a resevoir, and I need some help. Thanks!!!

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1. WHAT DO THE DIFFERENT COLOURS REPRESENT? Seven colours can be found on a map, each relating to different types of features. Black shows cultural features such as buildings, railways and power transmission lines. It is also used to show geographical names (toponymy), certain symbols, geographic coordinates, precise elevations, border information and surround information. Red is used for paved roads, highway numbers, interchange exit numbers, certain symbols as well as for names of major transportation routes. A red tint is used to show urban development. Orange indicates unpaved roads and unclassified roads and streets. Brownshows contour lines, contour elevations, spot elevations, sand and eskers. Blue represents water features, such as lakes, streams, falls, rapids, swamps and marshes. The names of water bodies and water courses are also shown in blue, as are magnetic declination and UTM (Universal Transverse Mercator) grid information. Green is used for wooded areas, orchards and vineyards. Grey is used on the back of the map to indicate the different symbols and a glossary of terms and abbreviations. Note: Purple can be used to show added information (update) over the original map detail.