Freshwater in streams, rivers, and lakes contains salt, too—about one pound in a thousand pounds of water. It doesn't taste salty because the concentration, or amount, of dissolved salt is too low for the taste buds on your tongue to detect. In most lakes, water flows in one end and out the other, keeping the salt concentration low. But salt can build up in lakes if they have no outlets. The Great Salt Lake in Utah is 10 times saltier than the ocean. When water flows into the Great Salt Lake, it can't flow out. Some water escapes by evaporation, but the salt it contained is left behind.