| Report Year: 2007 |
| Silver Lake (Dickinson), Dickinson County |
| Summary Data Table |
| 011: SLD 1 012: SLD 2 013: SLD 3 014: SLD 4 |
| Parameter | 6/5
(011) | 6/5
(012) | 6/5
(013) | 6/5
(014) | 6/19
(011) | 6/19
(012) | 6/19
(013) | 6/19
(014) | 7/10
(011) | 7/10
(012) | 7/10
(013) | 7/10
(014) | 7/24
(011) | 7/24
(012) | 7/24
(013) | 7/24
(014) | 8/7
(011) | 8/7
(012) | 8/7
(013) | 8/7
(014) | 8/21
(011) | 8/21
(012) | 8/21
(013) | 8/21
(014) | 9/11
(011) | 9/11
(012) | 9/11
(013) | 9/11
(014) | 2007 | 2006 | 2005 |
| Secchi Disk Depth (m) | 1.1 | 0.7 | 0.7 | 1.0 | 0.5 | 0.4 | 0.4 | 0.3 | 0.6 | 0.7 | 0.7 | 0.7 | 0.8 | 0.8 | 0.6 | 0.9 | 0.3 | 0.5 | 0.7 | 0.9 | 0.4 | 1.0 | 0.5 | 1.3 | 0.9 | 0.5 | 0.8 | 0.8 | 0.7 | 0.6 | 0.7 |
| Temperature(oC) | 18.0 | 18.0 | 18.0 | 18.0 | 22.0 | 22.0 | 22.0 | 22.0 | 26.0 | 26.0 | 25.0 | 26.0 | 25.0 | 26.0 | 26.0 | 25.0 | 24.0 | 24.0 | 23.0 | 23.0 | 23.0 | 23.0 | 23.0 | 23.0 | 18.0 | 18.0 | 18.0 | 18.0 | 22.3 | 22.6 | 22.7 |
| Dissolved Oxygen (mg/L) | 9.0 | 9.0 | 9.0 | 9.0 | 7.5 | 7.5 | 7.5 | 7.0 | 9.0 | 8.0 | 7.5 | 7.5 | 10.0 | 11.0 | 9.0 | 9.0 | 6.5 | 8.0 | 6.0 | 7.0 | 6.0 | 8.0 | 7.0 | 7.0 | 10.0 | 10.0 | 10.0 | 15.0 | 8.5 | 8.7 | 8.1 |
| Dissolved Oxygen Saturation (%) | 95 | 95 | 95 | 95 | 86 | 86 | 86 | 80 | 111 | 99 | 91 | 92 | 121 | 136 | 111 | 109 | 77 | 95 | 70 | 82 | 70 | 93 | 82 | 82 | 106 | 106 | 106 | 158 | 96.9 | 100.0 | 94.1 |
| Chlorophyll a (μg/L) | 6.6 | 2.9 | 3.0 | 4.2 | 15.7 | 17.0 | 25.8 | 15.8 | 47.4 | 45.1 | 107.0 | 30.4 | 61.8 | 58.8 | 51.2 | 3.4 | 289.9 | 84.2 | 16.4 | 45.6 | 321.3 | 24.4 | 223.5 | 0.9 | 22.6 | 44.2 | 32.4 | 21.3 | 58.0 | 60.3 | 143.9 |
| Total Phosphorus as P (μg/L) | 70 | 80 | 75 | 69 | 105 | 90 | 89 | 114 | 41 | 26 | 54 | 42 | 71 | 105 | 95 | 38 | 85 | 40 | 42 | 33 | 203 | 111 | 182 | 78 | 86 | 108 | 91 | 107 | 83 | 95 | 118 |
| Total Nitrogen as N (mg/L) | 5.32 | 4.23 | 5.33 | 4.95 | 3.67 | 3.88 | 4.16 | 3.97 | 2.25 | 2.59 | 1.73 | 2.17 | 0.32 | 0.52 | 0.64 | 0.68 | 1.15 | 1.03 | 0.88 | 0.82 | 1.59 | 2.12 | 3.30 | 1.55 | 1.50 | 1.63 | 1.25 | 1.52 | 2.31 | 3.34 | 2.99 |
| Microcystin (ng/L) | - | - | - | 44.7 | - | - | - | - | - | - | - | 1.0 | - | - | - | 2.3 | - | - | - | 0.2 | - | - | - | 0.2 | - | - | - | 2.1 | 8.4 | 3.0 | 1.9 |
| Carlson Trophic State Index (Secchi)* | 59 | 66 | 66 | 61 | 72 | 75 | 75 | 77 | 69 | 66 | 66 | 65 | 64 | 64 | 69 | 62 | 79 | 72 | 66 | 62 | 75 | 61 | 72 | 57 | 62 | 72 | 63 | 64 | 66 | 67 | 65 |
| Carlson Trophic State Index (Chl a)* | 49 | 41 | 42 | 45 | 58 | 58 | 63 | 58 | 68 | 68 | 76 | 64 | 71 | 71 | 69 | 43 | 86 | 74 | 58 | 68 | 87 | 62 | 84 | 30 | 61 | 68 | 65 | 61 | 70 | 71 | 79 |
| Carlson Trophic State Index (TP)* | 65 | 67 | 66 | 65 | 71 | 69 | 69 | 72 | 58 | 51 | 62 | 58 | 66 | 71 | 70 | 57 | 68 | 57 | 58 | 55 | 81 | 72 | 79 | 67 | 68 | 72 | 69 | 72 | 68 | 70 | 73 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |
| Carlson Trophic State Index Definition |