I just received an email alert that the muddy river has toxic levels of blue green algae. This algae is very toxic to dogs, and can be fatal to them if ingested. This includes leveret pond, willow pond and wards, the ponds and streams that flow from the jamaica pond towards brookline. here is the alert i received.

best,
louise

From Kate Bowditch:
Hello MMOC members-

Today while CRWA staff were out doing some water quality monitoring on the Muddy River, they saw obvious signs of blue-green algae (more formally called cyanobacteria, and not a true algae). While all algae stresses the river when in excess, blue-green algae in rivers and ponds is a particular concern because it can produce toxins which can cause allergic reactions in people upon contact, and has in some cases been known to kill dogs who drink it. We have been monitoring this problem on the Charles for several years, and when blue-green algae "blooms" reach dangerous levels, DCR posts signs warning the public about the potential risk and advising them to avoid contact with the water and to keep pets out of the water.
Our meter tests indicate levels of blue-green algae that are at or near the threshold for these warnings at the Agassiz Bridge, and visual indications of the blue-green algae continue downstream towards Charlesgate. Upstream of the Agassiz Bridge this problem was not observed. CRWA will conduct follow-up monitoring early next week and we will report to this body, as well as to DCR and other interested groups.

I have notified DCR of our findings, and suggested that they contact Hugh, as well as the Emerald Necklace Conservancy, if they feel it is appropriate to post warnings so that he can help, and perhaps recruit volunteers to help hang signs.

At these levels, given the uses of the Muddy River, I believe the main concern is to ensure that people do not let their dogs swim in our drink the water in the river where the blue-green algae is present. Fishing could pose some risks as well since fishermen could contact toxins as they handle fish and equipment. People walking along the banks are not considered at risk.
The main causes of blue-green algae blooms are warm temperatures, and high levels of nutrients, mainly phosphorus, in the water, especially water that is shallow and slow-moving. More information about blue-green algae can be found on the CRWA website at www.charlesriver.org.

Please pass the word to interested parties.