NEWS & EVENTS
August 25, 2023
A cyanobacteria ALERT has been issued for Lake Monomonac, Rindge. Cyanobacteria activity was first observed on 21 August, appearing as green clouds in the water and then specks accumulating on the surface. See the images attached, taken 21 and 24 August. Samples collected and reviewed on 24 August had cyanobacteria (Dolichospermum and Woronichinia) in concentrations up to 13,798 cells/mL in areas of highest observed accumulations. This is below the advisory level (70,000 cells/mL), however the material is appearing to be widespread in the waterbody, and may develop into a more significant bloom over time. The Alert will remain active for a week unless further reports of cyanobacteria are received. NHDES will resample if worsening conditions are reported.
NHDES urges lake users to perform visual assessments of the water prior to recreating. Stay out of the water and keep pets out if you can see any visual accumulation or coloration of the water and report it.
This is not an official cyanobacteria advisory, and signs do not need to be posted. I will be in contact again if conditions change, and an official advisory is issued.
Please forward this email to other residents / community members who need this information. If they would like to be added to the email distribution list, please have them sign up through this form to be directly included on future communications from NHDES. If you prefer to no longer receive these sampling updates, simply respond, and indicate "unsubscribe".
For more information:
June 1, 2023
***EDIT: Warning lifted June 8, 2023
A cyanobacteria WARNING (ADVISORY) has been issued for Monomonac, Rindge. Samples collected and reviewed on today 1 June had cyanobacteria (Dolichospermum) in concentrations up to 3 million cells/mL in areas of highest observed accumulations. Advisories are issued when cell counts exceed 70,000 cells/mL. NHDES advises lake users to not wade or swim in the water during an advisory. Please also keep pets and livestock out. The advisory is not based on a toxin evaluation and is intended as a precautionary measure for short term exposure.
NHDES will resample in a week. I will reach out to you before then for updates. If you have information on where accumulated material is being observed at that time, please let us know to guide our sampling efforts. Advisories remain active until the bloom subsides.
To the health officer or other official responsible for posting signs, please post our red cyanobacteria advisory signs at all public access points. Please let me know if you do not have any to post or if you need replacements.
Please forward this email to other residents / community members who need this information. If they would like to be added to the email distribution list, please have them sign up through this form to be directly included on future communications from NHDES. To sign up for Weekly Statewide Bloom Reports select the “Healthy Swimming Updates” email list.
If you prefer to no longer receive these sampling updates, simply respond, and indicate "unsubscribe".
For more information:
Please refer this link to learn more and see the map of areas being treated on the MA and NH portions of the lake: Weed Treatment 2022 PDF
No swimming, boating, or fishing on June 16 until completion of treatment, and irrigation will be restricted until June 23.