Water Chestnut Survey Maps

The following survey maps show the density of water chestnuts on the Assabet, Sudbury, and Concord rivers. These surveys are supported by the Nyanza Natural Resource Damages Funds

CISMA is coordinating a comprehensive assessment of water chestnut infestation in the Sudbury, Assabet, and Concord rivers and 130 acres of ponds in the Hop Brook Watershed. Water Chestnut locations are marked by a global positioning system (GPS), including estimates of patch sizes and patch density.  The CISMA Steering Committee selected OARS, a CISMA partner, to conduct the mapping and monitoring of the water chestnut. OARS staff will work with Mass Audubon to adapt and extend the GPS/GIS data input system developed in 2012.

Note: The maps below are displayed using popup windows to allow more than one map to be seen at a time. You will need to enable (switch on) popups in your browser to display the maps, if they are not already enabled.


Water Chestnut Surveys - June to August 2014

2014 Map Index

Water Clover Surveys - June to August 2014


Water Chestnut Surveys - June & July 2013