These streams flow in the spring during peak snowmelt, but do not have an adequate inflow to sustain them through the summer and fall unless there are periods of high rainfall. During dry times, these streams will simply be dried-up river beds. Amazingly, some aquatic insects may be able to survive in these streams by synchronizing their life cycles to when water is present in the stream. They can lay eggs that can survive dry periods until water returns. Examples along the Park Road: Numerous examples toward eastern end of park (e.g., between Miles 6 and 12)