| Report Year: 2007 |
| Lower Gar Lake, Dickinson County |
| Summary Data Table |
| 011: LGL 53 |
| Parameter | 6/12
(011) | 6/25
(011) | 7/10
(011) | 7/19
(011) | 8/5
(011) | 8/22
(011) | 9/2
(011) | 2007 | 2006 | 2005 |
| Secchi Disk Depth (m) | 0.4 | 0.3 | 0.2 | 0.2 | 0.2 | 0.3 | 0.3 | 0.2 | 0.4 | 0.5 |
| Temperature(oC) | 23.0 | 23.1 | 25.8 | 26.0 | 23.0 | 24.2 | 19.0 | 23.4 | 22.3 | 23.4 |
| Dissolved Oxygen (mg/L) | 5.9 | 7.1 | 3.8 | 7.6 | 0.6 | 7.8 | 7.5 | 5.8 | 7.2 | 8.4 |
| Dissolved Oxygen Saturation (%) | 69 | 83 | 47 | 94 | 7 | 93 | 81 | 67.6 | 81.4 | 97.5 |
| Chlorophyll a (μg/L) | 21.8 | 99.4 | 16.1 | 28.6 | 119.9 | 77.4 | 30.0 | 56.2 | 30.0 | 38.5 |
| Total Phosphorus as P (μg/L) | 71 | - | 142 | 137 | 110 | 93 | 190 | 124 | 98 | 84 |
| Total Nitrogen as N (mg/L) | 1.29 | 1.07 | 1.14 | 0.28 | 1.07 | 0.96 | 1.22 | 0.97 | 1.33 | 1.15 |
| Microcystin (ng/L) | 29.1 | 0.5 | 2.3 | 15.1 | 36.1 | 48.6 | 47.4 | 25.6 | 1.6 | 4.2 |
| Carlson Trophic State Index (Secchi)* | 75 | 80 | 85 | 83 | 83 | 77 | 80 | 80 | 73 | 70 |
| Carlson Trophic State Index (Chl a)* | 61 | 76 | 58 | 63 | 78 | 73 | 64 | 70 | 64 | 66 |
| Carlson Trophic State Index (TP)* | 66 | - | 76 | 75 | 72 | 70 | 80 | 74 | 70 | 68 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |
| Carlson Trophic State Index Definition |