wq_lake_grades

Lake Water Quality Grades

To better understand how these grades are developed, see the Explanation of Grades page for more details. In addition, the Detailed Lake Grades further detail grades and other water quality information for some of the lakes listed below. Click on the respective lake name to open a page about that lake.

Explanation of Grades

Lake Name

Watershed
Location

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

Lower

C+

C+

C+

Limited Access

A-

B+

B

Lower

B

B+

B-

B+

A-

Upper

A

A

A

A

A-

A

A

A

A

Limited Access

B-

D

B

Lower

D-

F

F

F

F

Upper

C

C

C

C

D

D

C

D+

C+

East Auburn Lake

Limited Access

C

C

B-

Upper

D+

D+

D

C-

C-

D

C-

D+

C-

Lower

C

C

C+

Limited Access

B-

C+

B-

Limited Access

D

F

D-

Limited Access

C-

D+

C

Lower

A

A-

A

A

A

Lower

B+

A-

B+

A

A

Lower

C

D+

C+

B-

C+

Limited Access

F

D+

F

Lake of the Isles

Lower

C

C

C

B-

C

Lake Name

Watershed
Location

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

Lake Minnetonka

Black Lake

Minnetonka

B+

C+

C+

C+

Browns Bay

Minnetonka

Carman Bay

Minnetonka

A-

B

B+

B+

Carsons Bay

Minnetonka

A

B+

B+

A-

A

Cooks Bay

Minnetonka

B

C+

C

B-

B-

B

C+

B+

B+

Crystal Bay

Minnetonka

B+

B-

B-

B

B+

A-

C+

B+

A-

East Upper Lake

Minnetonka

A-

B+

Forest Lake

Minnetonka

D+

D+

D

C-

C

D

D+

D+

C-

Gideons Bay

Minnetonka

A

Grays Bay

Minnetonka

A

B

B+

A

A

Halsted Bay

Minnetonka

D+

D

D+

C-

C-

D+

C-

C-

D+

Harrisons Bay

Minnetonka

C-

D+

D

C-

C

D+

C

C-

C+

Jennings Bay

Minnetonka

D

F

D

D

C-

D+

C-

D+

C-

Lafayette Bay

Minnetonka

A

B-

B+

B+

Libbs Bay

Minnetonka

B+

B-

Lower Lake North

Minnetonka

A

B+

B+

B+

Lower Lake South (Gale Island)

Minnetonka

A

B+

B+

A-

A

A

A

A

A-

Lake Name

Watershed
Location

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

Maxwell Bay

Minnetonka

B

C

C+

C+

B

C+

C+

C+

B

North Arm

Minnetonka

B

C+

B-

B-

B

B-

B-

C+

B

Peavey Lake

Minnetonka

C+

D

C

C

C

C+

C+

C+

Phelps Bay

Minnetonka

A-

B

B+

Priests Bay

Minnetonka

C+

C+

C+

B-

C-

St. Albans Bay

Minnetonka

A

B

B+

A

A

A

A-

B+

A-

Smithtown Bay

Minnetonka

A

B

B

A-

B+

Spring Park Bay

Minnetonka

A-

B

B

B+

A-

A

B+

A-

B+

Stubbs Bay

Minnetonka

C

C-

D+

C-

C

C-

C-

C

C-

Tanager Lake

Minnetonka

D

D-

D

D-

D

C-

D+

D-

Wayzata Bay

Minnetonka

A

B

B+

A-

A

A

A-

A

A-

West Arm

Minnetonka

D+

D

D+

C

C

D+

C-

D+

C+

West Upper Lake (Crane Island)

Minnetonka

B+

B-

B

A-

B

B+

B+

B+

B+

Lake Name

Watershed
Location

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

Lake Minnewashta

Upper

A-

B+

B

A-

B+

A

B+

B+

B+

Lower

C

C-

C-

C+

D+

Upper

C-

C

C

C+

Upper

F

D-

F

D

F

F

D+

D-

F

Upper

C

C-

C-

C

C-

C-

C

D+

C-

Limited Access

C+

C+

C+

Limited Access

B-

C+

C

Limited Access

C

D

B-

Limited Access

F

F

F

Upper

D+

D-

D-

D+

D

D+

D+

D

Upper

B+

B+

B

B-

A-

B

Powderhorn Lake

Lower

C-

C

C-

C

D+

Upper

C

C+

C+

C

C-

C+

B

Shavers Lake

Upper

D+

B-

Limited Access

D

F

F

St. Joes Lake

Upper

B+

A

Steiger Lake

Upper

B-

C+

C

C+

-

C+

Stone Lake

C+

-

C

-

C+

Limited Access

B+

B*

C+

C

C-

C+

Limited Access

C-

C

C+

Twin Lakes (St. Louis Pk)

-

D

-

D

D

D+

-

-

Upper

C-

D

D+

D

D+

C-

C

D

D

West Auburn Lake

Upper

-

-

B-

B-

C-

B-

-

B+

Windsor Lake

Upper

D+

D-

Limited Access

D

D

C-

Zumbra Lake

Upper

-

-

B

B+

B

B+

-

A-

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