The City of Duluth Stormwater Department 

is bringing back the Rip Rap Program!  
More details to come.....


What is rip rap?
  It can be described as 
rubble, shot rock, or rock armour.  It is rock or other material used to armor shorelines, streambeds, bridge abutments, pilings, and other structures against scour, water, or ice erosion. It is made from a variety of rock types, commonly granite, limestone, or occasionally concrete rubble from building and paving demolition. It is used to protect coastlines and structures from erosion by the sea, rivers, or streams. It is used on many waterways or water containments where there is potential for water erosion. 

Rip Rap works by absorbing and deflecting the impact of a wave before the wave reaches the defended structure. The size and mass of the rip rap material absorbs the impact energy of waves, while the gaps between the rip rap traps and slows the flow of water, lessening its ability to erode soil or structures. The mass of rip rap also provides protection against impact damage by ice or debris which is particularly desirable for bridge supports and pilings.

If you are interested and have more questions, please call the City of Duluth - Stormwater Department at 770.497.5311.  We are here to serve you!

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