| Report Year: 2009 |
| Lake Macbride, Johnson County |
| Summary Data Table |
| Parameter | 6/22/2009 | 7/27/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 13.5 | 13.3 | 13.4 | 13.6 | 13.3 | 13.5 | 13.5 | 13.2 | 13.7 | 11.8 | 13.9 |
| Thermocline Depth (m) | 6.5 | 6.6 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 2.3 | 1.0 | 1.6 | 1.3 | 1.0 | 0.9 | 1.7 | 1.4 | 1.9 | 1.4 | 0.9 |
| Temperature(oC) | 22.6 | 22.0 | 22.3 | 24.4 | 24.1 | 26.4 | 23.4 | 24.4 | 25.6 | 23.7 | 25.1 |
| Dissolved Oxygen (mg/L) | 10.8 | 6.5 | 8.7 | 8.6 | 9.7 | 10.2 | 9.6 | 9.4 | 8.7 | 11.1 | 3.1 |
| Dissolved Oxygen Saturation (%) | 125 | 75 | 99.8 | 103.0 | 115.2 | 126.9 | 113.1 | 111.5 | 108.6 | 136.2 | 38.3 |
| Specific Conductivity (μS/cm) | 370.0 | 370.0 | 370.0 | 341.5 | 354.7 | 343.5 | 353.6 | 351.3 | 440.8 | 367.5 | 331.8 |
| Turbidity (NTU) | 2.6 | 5.2 | 3.9 | 7.4 | 13.9 | 15.7 | 10.3 | 12.1 | 7.6 | 11.4 | 7.4 |
| Chlorophyll a (μg/L) | 10.0 | 10.0 | 10.0 | 27.5 | 34.7 | 76.0 | 19.6 | 22.7 | 9.6 | 8.9 | 22.1 |
| Total Phosphorus as P (μg/L) | 37 | 68 | 53 | 41 | 39 | 51 | 34 | 156 | 35 | 46 | 113 |
| SRP as P (μg/L) | - | - | - | 1 | 1 | 2 | 2 | 1 | 1 | - | - |
| Total Nitrogen as N (mg/L) | 1.64 | 1.27 | 1.46 | 2.40 | 1.48 | 1.44 | 2.25 | 1.51 | 1.60 | 5.36 | 1.12 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 16 | 16 | 16 | 24 | 16 | 177 | 147 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 3.9 | 1.3 | 2.6 | 4.6 | 0.7 | 27.7 | 9.1 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 1.00 | 0.25 | 0.63 | 1.54 | 0.49 | 0.51 | 1.17 | 0.15 | 1.08 | 3.99 | 0.27 |
| TN:TP ratio | 44 | 19 | 31 | 70 | 44 | 35 | 81 | 16 | 58 | 146 | 11 |
| pH | 8.9 | 8.8 | 8.8 | 8.7 | 9.0 | 8.7 | 7.5 | 8.5 | 8.5 | 8.5 | 7.1 |
| Alkalinity as CaCO3 (mg/L) | 129 | 118 | 124 | 122 | 105 | 117 | 85 | 75 | 113 | 145 | 106 |
| Silica as Si (mg/L) | - | - | - | - | - | 2.17 | 2.40 | 2.08 | 1.36 | - | - |
| Dissolved Organic Carbon (mg/L) | 4.02 | 3.73 | 3.88 | 4.04 | 4.20 | 6.69 | <3.6 | 6.58 | 6.84 | - | - |
| Inorganic Suspended Solids (mg/L) | 6 | 4 | 5 | 3 | 4 | 4 | 2 | 2 | 3 | 5 | 3 |
| Volatile Suspended Solids (mg/L) | 2 | 10 | 6 | 4 | 6 | 7 | 4 | 6 | 5 | 3 | 5 |
| Total Suspended Solids (mg/L) | 8 | 14 | 11 | 7 | 10 | 11 | 6 | 8 | 8 | 9 | 8 |
| Carlson Trophic State Index (Secchi)* | 48 | 61 | 53 | 56 | 60 | 61 | 52 | 55 | 51 | 55 | 61 |
| Carlson Trophic State Index (Chl a)* | 53 | 53 | 53 | 63 | 65 | 73 | 60 | 61 | 53 | 52 | 61 |
| Carlson Trophic State Index (TP)* | 56 | 65 | 61 | 58 | 57 | 61 | 55 | 77 | 55 | 59 | 72 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |