How Healthy is Your Water?
41.651743, -70.827858 41.649840, -70.827640

Mattapoisett River Mouth Snapshot

32
out of 100
Bay Health Index (5-year average)
poor
fair
good
32
32
out of 100

Supporting Data

Mattapoisett River Mouth: Rail Trail Bridge (Station MH3)
Nitrogen, dissolved oxygen, algae, and water clarity measurements taken from shore and boat by the Mattapoisett Rail Trail bridge crossing the river. (41.651743, -70.827858)
Total Nitrogen
Dissolved Inorganic Nitrogen
Total Organic Nitrogen
Dissolved Oxygen
All Measurements
Average of Lowest 20%
Algal Pigments
Total Pigments
Water Clarity
Yearly Average
Mattapoisett River Mouth: Private Dock southwest of Rail Trail Bridge (Station MH3A)
Nitrogen, dissolved oxygen, algae, and water clarity measurements taken from a dock. (41.649840, -70.827640)
Total Nitrogen
Dissolved Inorganic Nitrogen
Total Organic Nitrogen
Dissolved Oxygen
All Measurements
Average of Lowest 20%
Algal Pigments
Total Pigments
Water Clarity
Yearly Average
Mattapoisett River Mouth: Site
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Bay Health data is funded in part by the Massachusetts Environmental Trust.
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Become a Baywatcher

Help the Buzzards Bay Coalition keep an eye on the health of the water in your community. Become a Baywatcher, and you can volunteer as a "citizen scientist" on the water this summer.

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Top Stories on Mattapoisett Harbor/Eel Pond

State Invests More Than $1M to Restore Wetlands at BBC’s Mattapoisett and Rochester Reserves

The Massachusetts Department of Fish & Game’s Division of Ecological Restoration (DER) is investing more than $1M to advance restoration of natural wetlands at two retired cranberry farms and at other impacted aquatic habitats throughout the Bay watershed.

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River herring numbers are up in some Bay waterways – but there’s more work to do

Population counts of river herring were up in three of Buzzards Bay’s most important rivers — the Agawam, Acushnet, and Mattapoisett Rivers — during spring 2019. But rising numbers don’t mean that the work to protect river herring has ended.

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Restoration of The Bogs in Mattapoisett will improve property for water, wildlife, and people

The streams and wetlands at The Bogs in Mattapoisett will provide improved water flow and better wildlife habitat as part of a Coalition-led restoration project, beginning later this year.

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Working to Save Buzzards Bay

The Buzzards Bay Coalition is a membership-supported organization dedicated to improving the health of the Buzzards Bay ecosystem for all through education, conservation, research, and advocacy.

We work to protect clean water on the Bay and on the land: