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Besides, can you dam a creek?
A dam is a structure that stops water from flowing. Sand bags and rocks are an easy way to dam a backyard creek. Alternate layers starting on the creek bed spot you want to dam. Use a sledge hammer to drive the 4 foot long 2 by 4 inch boards down into the creek bed at each side, a foot deep.
Similarly one may ask, can you build a dam on a small creek?
Building dams in creeks is illegal. If you see a dam on a creek, please dismantle it.
Yes a pond built with a large watershed (large enough to create a creek, even a seasonal creek) has some serious dam and overflow handling capabilities to consider to handle the seasonal and weather event flows.