| Report Year: 2009 |
| Lake Icaria, Adams County |
| Summary Data Table |
| Parameter | 7/14/2009 | 6/9/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 8.1 | 8.0 | 8.1 | - | - | 7.8 | 9.9 | 8.9 | 9.1 | 9.5 | 9.0 |
| Thermocline Depth (m) | 5.9 | 5.8 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 0.7 | 0.9 | 0.8 | - | - | 2.3 | 0.9 | 1.4 | 1.1 | 0.8 | 0.7 |
| Temperature(oC) | 24.6 | 21.3 | 22.9 | - | - | 24.1 | 22.2 | 23.5 | 23.3 | 23.1 | 25.5 |
| Dissolved Oxygen (mg/L) | 8.6 | 10.4 | 9.5 | - | - | 7.7 | 5.4 | 8.8 | 8.7 | 6.2 | 7.9 |
| Dissolved Oxygen Saturation (%) | 104 | 117 | 110.2 | - | - | 91.5 | 61.9 | 102.8 | 101.4 | 70.2 | 96.3 |
| Specific Conductivity (μS/cm) | 250.0 | 280.0 | 265.0 | - | - | 340.5 | 294.5 | 293.5 | 292.5 | 239.0 | 281.0 |
| Turbidity (NTU) | 12.9 | 14.0 | 13.4 | - | - | 7.6 | 19.1 | 10.8 | 14.2 | 24.3 | 22.0 |
| Chlorophyll a (μg/L) | 66.0 | 17.0 | 41.5 | - | - | 16.9 | 6.8 | 26.4 | 19.1 | 23.2 | 12.6 |
| Total Phosphorus as P (μg/L) | 65 | 38 | 51 | - | - | 37 | 52 | 64 | 46 | 65 | 118 |
| SRP as P (μg/L) | 1 | - | 1 | - | - | 27 | 11 | 1 | 3 | - | - |
| Total Nitrogen as N (mg/L) | 1.26 | 0.99 | 1.13 | - | - | 3.40 | 3.00 | 1.41 | 1.49 | 2.84 | 1.43 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 16 | 21 | 16 | - | - | 107 | 333 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 1.8 | 4.5 | 3.1 | - | - | 9.7 | 17.6 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 0.12 | 0.97 | 0.53 | - | - | 2.41 | 1.64 | 0.45 | 0.59 | 2.27 | 0.29 |
| TN:TP ratio | 20 | 26 | 23 | - | - | 102 | 59 | 24 | 35 | 45 | 13 |
| pH | 9.0 | 8.8 | 8.9 | - | - | 8.2 | 8.0 | 8.2 | 8.1 | 8.0 | 7.8 |
| Alkalinity as CaCO3 (mg/L) | 109 | 121 | 115 | - | - | 132 | 117 | 86 | 114 | 88 | 125 |
| Silica as Si (mg/L) | - | - | - | - | - | 3.89 | 4.02 | 1.57 | 1.50 | - | - |
| Dissolved Organic Carbon (mg/L) | 4.91 | 5.36 | 5.14 | - | - | 5.90 | 6.10 | 9.88 | 7.96 | - | - |
| Inorganic Suspended Solids (mg/L) | 15 | 4 | 9 | - | - | 9 | 13 | 9 | 8 | 11 | 9 |
| Volatile Suspended Solids (mg/L) | 13 | 7 | 10 | - | - | 3 | 9 | 7 | 8 | 4 | 4 |
| Total Suspended Solids (mg/L) | 27 | 10 | 19 | - | - | 12 | 22 | 16 | 16 | 15 | 14 |
| Carlson Trophic State Index (Secchi)* | 65 | 62 | 63 | - | - | 48 | 61 | 56 | 58 | 63 | 65 |
| Carlson Trophic State Index (Chl a)* | 72 | 58 | 67 | - | - | 58 | 49 | 63 | 60 | 61 | 55 |
| Carlson Trophic State Index (TP)* | 64 | 57 | 61 | - | - | 56 | 61 | 64 | 59 | 64 | 73 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |