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Photos of aquatic plant growth in Rogers Lake. <br /> A. <br /> A"Woo <br /> 4 <br /> May 27,2009 June 10,2009 August 4,2009 Decomposing large-leaf <br /> pondweed. <br /> Rogers Lake Water Quality Results <br /> Rogers Lake 2009 5/13/2009 5/27/2009 6/10/2009 6/24/2009 7/8/2009 7/22/2009 8/4/2009 8/19/2009 9/2/2009 9/16/2009 <br /> 1050 1030 10:10 10:15 10:15 1040 1025 945 10:15 920 <br /> Units R.L.* Results Results Results Results Results Results Results Results Results Results Average Min Max <br /> H 0.1 7.17 6.47 6.93 5.81 5.73 5.76 5.60 5.64 5.30 5.52 5.99 5.30 7.17 <br /> Conductive ms/cm 0.010 0.780 0.083 0.075 0.074 0.069 0.061 0.059 0.062 0.061 0.063 0.139 0.059 0.780 <br /> Turbidity FNRU 1 4 3 0 3 7 2 3 2 4 3 3 0 7 <br /> D.O. /L 0.01 7.78 4.03 2.81 1.39 1.16 1.13 0.21 1.63 1.25 2.22 2.36 0.21 7.78 <br /> D.O. % 1 78% 42% 26% 16% 13% 10% 2% 18% 12% 20% 24% 2% 787/. <br /> Temp. °C 0.1 16.0 17.6 14.9 24.5 21.6 19.9 21.0 20.2 18.0 19.4 19.3 14.9 24.5 <br /> Temp. °F 0.1 60.8 63.7 58.8 76.1 70.9 67.8 69.8 68.4 64.4 66.9 66.8 58.8 76.1 <br /> Salinity % 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 <br /> Ct-a u 1 7.4 19.4 4.7 7.5 5.8 4.8 2.3 6.2 5.0 7.4 7.1 2.3 19.4 <br /> T.P. /L 0.005 0.031 0.054 0.037 0.0401 0.0491 0.0361 0.024 0.170 0.025 0.035 0.050 0.024 0.170 <br /> T.P. LEFA 5 31 54 37 4049 36 24 170 25 35 50 24 170 <br /> Secchi ft 0.1 >max depth >4.8 >4.7 >4 14 >4 14 14 >4 >4 <br /> Secchi m 0.1 >max de th >1.5 >1.4 >1.2 >1.2 A.21 >1.2 >1.2 >12 >1.2 <br /> Field Observations 0 t <br /> Ph sical 1.0 1.5 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 1.9 1.0 2.0 <br /> Recreational 1.0 1.5 2.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 4.0 1.0 5.0 <br /> *reporting limit <br /> 2()()9 D CVa O TP <br /> T.P. Historic Summertime Mean o Ci-a <br /> Phosphorus,Chlorophyll-a&Transparency f Secchi(ft) - Secchi(ft) <br /> 110 0 120 0 <br /> 2 2 <br /> 190 170 4 0100 • • • 4 r <br /> 80 <br /> 70 8 5 80 8 a <br /> 50 12 60 10 0 <br /> a 40 1412 z <br /> a 30 16 w a 40 14 v <br /> t 20 18 20 16 <br /> 10 20 18 <br /> 0 22 0 20 <br /> 00 00 00 00 00 00 00 00 00 00 rn rn rn rn rn rn rn rn rn o 0 0 0 0 0 0 0 0 0 <br /> rn rn rn rn rn rn rn rn rn Yeao 0 0 0 0 0 0 0 0 <br /> Rogers Lake Mstoirical Means <br /> Agency CAMP ACD ACD ACD ACD ACD ACD <br /> Year 1 91 98 2000 2003 2006 2008 2009 <br /> TP(ug/L) 42.70 64.70 38.4 110.0 32 50 <br /> Cl-a (ug/L 20.30 35.10 19.4 38.5 12.3 7.1 <br /> Secchi(m) 0.81 0.85 0.91 n/a 0.7 n/a n a <br /> Secchi(ft) 2.7 2.8 3.00 n/a 2.3 n/a n/a <br /> Carlson's Trophic State Index <br /> TSIP 58 62 57 72 54 61 <br /> TSIC 60 62 601 67 55 50 <br /> TSIS 63 621 63 n/a 65 n/a n a <br /> TSI 59* 62* 58*1 68 55* 55* <br /> Rogers Lake Water Quality Report Card <br /> Year 1 91 1 98 1 2000 1 2003 1 2006 1 2008 2009 <br /> TP C C C D B- C <br /> Cl-a C C ��B <br /> C B A <br /> Secchi D n/a* n/a* * D- n/a* n/a` <br /> Overall C C D BB <br /> *Secchi transparency not included because as secchi depth exceeded lake depth <br />