9.a) Addition- Bone Lake Statistics � .
Bone Lake --�
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• DNR ID#: 820054 � ��
• Municipality: City of Scandia � I '
• Location: Section 5 T32N-R20W ��,� \ �
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• Lake Size: 210 Acres ����� ',�.
• Maximum Depth: 32 ft ��V�,g��.
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• Ordinary High Water Mark: 909.1 ft �����\���
• 58%Littoral ,
Note: Littoral area is the portion of the lake<15 ft and ��1��� �,
dominated b a uatic ve etation. �'�I�\1��•.
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Summary Points
' • Bone Lake was considered a eutrophic lake in 2010, based on the Carlson Trophic State
Index (similar to 2006-2009).
• Bone Lake's summer phosphorus mean was lower than that experienced in 2003-2008.
• Bone Lake is listed on the 1�1PCA's Impaired "'aters List for excessive nutrients.
• Eurasian 1�"Tilfoil and Curly leaf pond�r�eed (invasi��c ayuatic plants) are estensive in
this lake.
• Carp removal was done in winter of 201 l.
• The major land use is rural/agricultural.
• The lake does stratify throughout the summer months.
Average Summer Surtace Total Phosphorus '
Average Summer Secchi Transparency ,
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Page 1 of 3
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2010 WATER QAULITY READINGS
Total
Total Kjeldahl Secchi
Phosphorus Chlorophyll- Nitrogen Disk
Date m /L a u /L m /L De th m
5/16/10 0.024 20 0.99 2
5/31/10 0.017 4.5 0.89 2.1
6/15/10 0.024 14 0.91 2
6/20/10 0.028 12 1 1.8
7/19/10 0.02 5.7 0.88 1.7
8/6/10 0.029 6.4 1 2
8/28/10 0.077 10 0.94 1.5
9/8/10 0.043 9.8 1.3 1
9/19/10 0.03 26 1.1 1.4
10/1/10 0.034 34 1.1 1.4
10/15/10 0.035 24 1.3 1.2
2010 Summer Avera e 0.037 15.988 1.078 1.500
Water Quality threshold is 0.04 mg/L TP or higher*
High High Date Low Low Date Avera e
2010 Elevation (ft) NA NA NA NA NA
'MPCA description of Impaired Lake's Listing criteria: "At a minimum, a decision that a given lake is impaired for the 303(d) list due to
excessive nutrients will be supported by data for both causal and response factors. Data requirements for 303(d)listing consist of 12 or more
TP measurements collected from June through September over the most recent 10-year period. Ideally this should represent 12 separate
visits to the lake over the course of two summers; however it might also reflect four monthly samples over the course of three years(a typical
sampling regimen for many lake monitoring programs). In addition to exceeding the TP guideline thresholds, lakes to be considered for 303(d)
listing should have at least 12 Secchi measurements and 12 chlorophyil-a measurements. This amount of data will allow for at least one
season (preferably more) of paired TP, chiorophyll-a, and Secchi disk data and provide a basis for evaluating their interrelationships and
Lake Water Quality Summary
Trophic Status Lake Grades
2009 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000
Total Phosphorus (mg/I) Eutrophic C C C C C C C D C C C
Chlorophyll-a (ug/I) Eutrophic B B B B B C+ C C C C C
Secchi de th ft Eutrophic C C C C C C C C C B C
Overall Eutrophic C+ C+ C+ C+ C+ C C G C C+ C
hence the trophic status of the lake."
Bone Lake, TP and Chl-a
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Page 2 of 3
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BONE LAKE
WATER SURFACE ELEVATION STATISTICS
Outlet Elevation (culvert) = 907.3
Ordinary High Water Level (OHW) elevation = 909.1
100 Year Flood Elevation (CLFLWD) = 910.6
Highest recorded: 910.97 ft (07/07/1975)
Lowest recorded: 906.7 ft (11/07/1966)
Datum: NGVD 29 (ft)
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Page 3 of 3 ,
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Long Term Plan
�� Watershed nutrient reductions -ongoing
• Residential and commercial areas
• Roads
• Agricultural
� Internal load reductions
• Sediment release - aoi4
• Curly leaf pondweed - ??
• Control of rough fish - �oia �
�� Shoreline management activities - ongoing
• Shoreline erosion
• Water runoff
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�� Watershed District - engineering, construction, and
operation and maintenance
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Doug Thomas 651-209-9753 doug.thomas@clflwd.org
5