section_path: Types/By structure/Fixed-crest dams
section_name: Fixed-crest dams
paragraph_text: Fixed-crest dams
  
  A fixed-crest dam is a concrete barrier across a river. Fixed-crest dams are designed to maintain depth in the channel for navigation. They pose risks to boaters who may travel over them, as they are hard to spot from the water and create induced currents that are difficult to escape.