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Mystic River

(Fresh Water)

Mystic River(Salt Water)

Little River

Upper M

ystic

Lake

Island

End R

iver

Mald e

nRive

r

ARLINGTON

MALDEN

WILMINGTON

SOMERVILLE

WAKEFIELD

CAMBRIDGE

READING

WOBURN

MELROSE

LEXINGTON

WATERTOWN

MEDFORD

CHELSEA

B O S T O N

STONEHAM

REVERE

BURLINGTON

WINCHESTER

WINTHROP

BELMONT

EVERETT

Mill Brook

Winn's Brook

Alewife Brook

Aberj

onaRiv

er

Meetin

gho

useBroo

k

Mill Creek

Chelse

a Cree

k Bel le Is le Inlet

5

2016 Mystic RiverWatershed Report Card(based on 2014-2016 bacterial data)

0 1 20.5Miles

Mystic River Watershed Water Quality Grades and Compliance Rates - Calendar Year 2016

Mystic River WatershedTown Boundary

Mystic River Watershed AssociationMassachusetts Water Resources Authority

Monitoring Points!(

#*

Average Compliance Rates for Swimming and Boating StandardsA B C FD

100-86 85-71 70-56 55-40 39-0

Data Sources: Mystic River Watershed Association, U.S. EPA, Massachusetts Water Resources Authority, MassGIS.Basemap: Canvas/World Light Gray Base © ESRI and its data suppliers. EPA Region 1 GIS Center map #11498, 5/24/2017

GradeA+AA-A-A-

AverageWater Segment Compliance RateUpper Mystic Lake 98.9%Chelsea Creek 91.2%Mystic River (Salt Water) 87.6%Mystic River (Fresh Water) 85.8%Belle Isle Inlet 85.7%

C+C+C

Meetinghouse BrookMalden RiverAberjona River

66.5%65.1%61.8%

D+D+DD-FF

Alewife BrookMill BrookLittle RiverWinn's BrookIsland End RiverMill Creek

54.2%53.1%49.4%42.0%36.3%33.5%