The Chapter 105 Program regulates any water obstructions and encroachments located in, along, across, or projecting into a watercourse, floodway, or body of water, whether temporary or permanent. The obstructions and encroachments may include bridges, culverts, stream enclosures, watercourse, wetland fills, outfalls, utility lines, stream relocation, streambank stabilization, stream restorations, wetland restorations, temporary road crossings, permanent road crossings, docks, and piers.

Why Regulate Streams?

  • Streams are an important part of our natural scenery, beauty, and Pittsburgh.
  • Streams act as a public resource, from recreational uses, drinking water, and flood prevention.
  • Streams have sediment control, which will reduce water treatment costs, dredging costs, and flood frequency.
  • Streams also have nutrient control, which will improve recreational opportunities, reduce water treatment costs, human health risks, and improve the water quality downstream.
  • Streams have flood control which helps local communities by reducing local and downstream flooding, preventing excessive erosion, and mitigating property damage and risks to human welfare.
  • Streams need to be regulated to protect and promote public benefit.