MARINE NOTICE No 61 of 2021
Shannon Navigation
Algal Bloom
Waterways Ireland wishes to advise users of the Shannon Navigation that a
number of locations throughout the Shannon in particular harbours and bays
have or are likely to experience algal blooms in recent days and weeks. This
seasonal phenomenon is evident as a light “Pea-green” and /or Green, Blue or
Blue-Green colour in the water column on or near the water’s surface.
Information from the HSE guidance document “Interim Fresh Water Algal Bloom
Guidance” is as follows:
• Affected waters may contain high levels of blue-green algae which may
cause illness in humans and animals including pets
• Avoid contact with scum, visible algae and surrounding water
• Do not swim or partake in immersive watersport activities in water near
visible algae
• Do not touch scum on the shore
• Wash hands if you touch the algal material
• Keep children and pets away from the water’s edge
• Do not let pets drink the water.
• Wash pets if they come into contact with water
Waterways Ireland thanks its customers for their understanding in relation
to this matter.
P Harkin
Inspector of Navigation
15 September 2021