River and Stream Continuity Project

Crossing Problems

There are a number of ways for a road to cross a river or stream. These include bridges, fords, open-bottom or arch culverts, box culverts, and pipe culverts. Depending on the type of crossing, its size, method of installation, and maintenance, a road crossing may have many or relatively few adverse impacts on a river or stream ecosystem.

The movement of organisms within rivers and streams is an important ecological process that can be significantly affected by road crossings. There are a variety of ways that crossing structures can impede or prevent the movement of animals.

Inlet or outlet drop

  • Physical barriers
  • Excessive velocities
  • Insufficient water depth
  • Turbulence
  • Absence of bank edge
  • Discontinuity of channel substrate

 

 

 

 

 

Back to Top

UMass Extension logo
New England Regional Water Quality logoThis material is based upon work supported by the Cooperative State Research, Education, and Extension Service, U.S. Department ofAgriculture, under Agreement No. 2004-51130-03108.