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9.a) Addition- Bone Lake Statistics � . Bone Lake --� �- ��)��3 �.s���l' �,1'21(�E': ��-� ��— .�� � � �� (� • DNR ID#: 820054 � �� • Municipality: City of Scandia � I ' • Location: Section 5 T32N-R20W ��,� \ � � � • Lake Size: 210 Acres ����� ',�. • Maximum Depth: 32 ft ��V�,g��. �.,. • 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��•. Y q g ,,i �� , � I'�i� ��� '�� V ��\ � �� � �;��_ � � 2� 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 , r,�o ------_— � . �,r r._ _,g >��14 iG�s 2L�;t 2G�' ,n�� _r�io _) � _.. , I --Tot:YPhaSPhol'ous '�-�"� i. �.. U'.;'3 ------------------------- .. --":�.� :;. 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Page 1 of 3 . , 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 izo i�o ioo _ ioo so __ _ _ so 60 - 60 �TP Summcr Avg e ��Chlor-a Summer Avg 40 40 TP Impairment Threshold :1 � - - - Chlor-a Impairment Threshold 20 � .., _.. �. `. �, 20 � � �_ �. _ � �_.� �. � � �: �: � �: f � ti��'\~�ti�~\1�ti�1\1�ti�1\1�ti�~\��ti�1\�o0��'\�oo�y\�oti�~\�oti�y\�oo�~\�oyo _ ___— Page 2 of 3 l � 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) I Bone - 8290540� 910 909.25 `~��, t '�- + � �� �� � + � 0 9os.s '� � I � v �� � � � ,� w � I � � ' �� � I � � �� � ti � 907.75 I'{ ��� � 5�'� ��I, N I �� 9 67 2001 2002 2003 2004 2005 20p6 2007 2048 2009 Page 3 of 3 , ` ' 6/21/2011 � �. � � ��`'�'��;,�- - ��� ::�� �s ��� � `}'� � ��°n�,� t � � �`-"`�.:. ;' r.���'? a 4aa: ��'� '����a�+sp.�x �.F � � ' r � � s � • � � � � • � 1 8 0 # ' � ;.,, i �� .._... . ._._....:....�..��,.a...«nr•y%�� . , Bone La !<e VVater Quality _-_� Average Summer Surface Total Phosphorus ', o,o --- . 009 ------- -- ' --TdeiP�wanwaua -we«O��nvS�ma.N � b � , ' ',.i '�i� i ��5� .. ,i �I ' w��_�_._____�._"_._._� a __,_�.: E �e �y • e �T � ; �"' . � '�i}8 ..,, . � , y ��� s.��Y�y' :"['"� _ ' ' �a�15W', "4'�� t �'�.� .F'"'�'RP Q ,C i 3 t,'� �.J..y._ .�� "1'P v-�t '.. "��,.' �.,* ' 0o i 0.00 . ... �'�. 2001 2D02 200J 2004 2005 2006 .OQI �008 200B 2010 2011 �'. 1 6/21/2011 ` . �,. , ,... - Relationship between TP �y� and Transparency Oligotrophic Mesotrophic Eutrophic Hyper- Eutrophic , ` ,� _ i �TT[�T� TotalPhosphorus(µg/L) r�� _._:..._�.. _��-.. 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 2 ' 6/21/2011 � ,.�.., � 2 _ Carp Harvest 010 �� ��' � �� , �� � � � �� x_"''x`» � I - � .''•:�"" y:: .�+R:.� - av-L � . I _ _ ..�„� _ _. � �. '�,r r` .� "' .• "� �° _�- �� �.. �c ,.v� .,,. _.,�,.���. -~�', . .y -^�.> �- i � �`•�'" ��� •,.r wr,,." 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I I�,�. �'li I Ill��,,i'I I �; I I� � I� � '� i� � I ��I � �I���I �I' . i il�l � '��i � I ��ae•n�so� �I� !I ilil' �I'�Ill�li�l'I I � � il� I� ; � II � � � ,�I� i� —� ��I I,.i ; II_',� �I �.�� � !=1__'�'_J'— i I-- � Connec;ing Bands', S;oo Lo�]s"� � 24"Culven F -" 3n'Culven 3 6/21/2011 = � : �,,:., ---�---______.___. __ .�. .�:�,ru v Bone Lake inlet Structur� _ _ � _ � M�, � .-cwss i aivR,�v _. . ' . rc=naeo? . +uu eu� �s*ow.rtecr�sc-�+�, ^ NAMBLft. - FTSrqUCTUH[ `+C I Illl���` �ISEEDE�Ali.... •IIII�� •. II. ���.�I�I III IIIII r'hSEMEMTPATCII�� 1�96. III II I I I I �I��f c RrP II I U I I f�I �� � I� II� �I I IJI., �irsiv.wmcvaeo=no � i�� i�i� �� II�, I�ii,. II,�,;� �; ti �� � �� , ,� Il�i ��„� � �I�I�I�'��' �li � �� ����� , � �� „�;A�e� � `' s;��Ur �{ � ��,.� � CIIPMBER , � -. CLA55 1 41PRM--.. ..a � . . .. . � . . � .�:.h+^tG"" ... P� �'��le�"� �� Watershed District - engineering, construction, and operation and maintenance � DNR - $a83,000 grant & Public Waters Permit � Scandia- Encroachment/Access Agreement, local permit � County- Encroachment/Access Agreement 4 ' ' 6/21/2011 Questic�ns? � � � ` ���� �t, �. �< � , � a. �.r' � � -�---� ' —,_-`_ � � �r !�.- _ - _ .r_, , ` _.. . .,. �.._. ._. _ .. ._. _....��_.... :__.: ..:-�z�r�&a.�sasxr��--�'—� ..,..._...Y �,...-..� � . .,w�'"`w."�_..�„ � �...... .....:.. _.... -:,...». .I - .N�:.�M. . . . . ... . ' �- �1. . . ,..w .. �� . . � �.iA' __.._.._,.. Doug Thomas 651-209-9753 doug.thomas@clflwd.org 5