4.6 Shorelines and Streambanks

Goal 6 - Shorelines and Streambanks

Preserve the natural appearance of shoreline areas and minimize degradation of surface water quality which can result from dredging operations.

Discussion

Eroding shorelines and streambanks contribute to the degradation of water quality.  Native vegetation can effectively stabilize these areas, filter runoff for sediment and other pollutants, and provide habitat.  Restoration of shoreline and streambanks on the lakes, Six Mile Creek, and wetlands within the subwatershed is a key strategy for meeting this plan’s goals.

The key areas identified in this plan for conservation activities include buffer zones adjacent to streams and channels.  In some cases these buffer zones are riparian or flow-through wetlands, and those wetlands have been identified as key conservation areas.  Where streams and channels flow through upland areas, conservation of native vegetation within these zones would also increase or maintain infiltration rates; decrease or maintain runoff rates and pollutant conveyance to water resources; and help minimize erosion.   Restoration of lakeshore would have the same benefits.  Sustaining or improving water quality and ecological integrity is necessary to meet District goals as well as to meet state and federal nondegradation, water quality and biological integrity requirements and to prevent the need for future TMDLs.  

Desired Outcomes:  Stable streambanks and shorelines to supplement other goals.

Metrics:

  • Stream Visual Assessment Protocol (SVAP) in Six Mile Creek
  • Linear feet of stabilized eroded shoreline and streambank
  • Linear feet of shoreline and streambank protected in Key Conservation areas
  • Linear feet and width of riparian areas protected in Key Conservation Areas

Goal 6.1 - Six Mile Marsh

Promote shoreline restoration and shoreline buffer creation as methods to help meet pollutant loading reduction and ecological integrity goals.

Actions

  1. Restore degraded streambanks on Six Mile Creek to achieve a Stream Visual Assessment Protocol mean score above 5.0 and on other streams to stabilize streambanks; reduce pollutant loading, erosion and sediment transport; and increase habitat.   Figure 20 illustrates areas of high priority for improvement because of bank failure as identified in the Upper Watershed Stream Assessment or in the lakes TMDLs.
  2. Periodically update the Six Mile Creek stream assessment to assess current stream condition and ecological integrity.
  3. Promote native vegetation over structural shoreline stabilization in District policies, regulations, and programs.
    1. Provide education and training opportunities, technical and planning assistance, and demonstration project funding to LGUs to assist them in restoring shorelines and buffers on public property such as parks and open spaces.
    2. Develop and distribute written material to shoreline property owners explaining the benefits of shoreline restoration and buffer creation to the reduction of pollutant loads and creation of shoreline habitat and providing design, plant selection, installation, and maintenance advice.
    3. Develop a small grant program to provide financial assistance to property owners desiring to restore their shoreline or plant a buffer.