The maps below show the status of Himalayan Balsam on the Cam, during the year. Zoom into map and click on markers for more detail. See map key at the bottom of this page
Downloadable detailed status report: Survey of Himalayan Balsam in the Cam Catchment 2019
White cross in black circle denotes absence above point
Purple – abundant
Orange – common
Grey – occasional
Blue – not surveyed
Black pointers are STWs. At Newport, Balsam reported in 2017 (Rob Mungovan) but none seen in 2019.