| Report Year: 2011 |
| Lake Macbride, Johnson County |
| Summary Data Table |
| Parameter | 6/21/2011 | 8/9/2011 | 9/19/2011 | 2011 | 2010 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 13.4 | 12.9 | 13.1 | 13.1 | 13.3 | 13.4 | 13.6 | 13.3 | 13.5 | 13.5 | 13.2 | 13.7 | 11.8 | 13.9 |
| Thermocline Depth (m) | 3.0 | 3.2 | 7.0 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 1.5 | 0.7 | 0.7 | 0.9 | 0.6 | 1.3 | 1.3 | 1.0 | 0.9 | 1.7 | 1.4 | 1.9 | 1.4 | 0.9 |
| Temperature(oC) | 25.0 | 28.0 | 19.6 | 24.2 | 23.8 | 23.2 | 24.4 | 24.1 | 26.4 | 23.4 | 24.4 | 25.6 | 23.7 | 25.1 |
| Dissolved Oxygen (mg/L) | 14.7 | 9.3 | 4.8 | 9.6 | 8.4 | 8.0 | 8.6 | 9.7 | 10.2 | 9.6 | 9.4 | 8.7 | 11.1 | 3.1 |
| Dissolved Oxygen Saturation (%) | 178 | 119 | 52 | 116.5 | 100.2 | 93.1 | 103.0 | 115.2 | 126.9 | 113.1 | 111.5 | 108.6 | 136.2 | 38.3 |
| Specific Conductivity (μS/cm) | 340.0 | 280.0 | 330.0 | 316.7 | 313.3 | 346.7 | 341.5 | 354.7 | 343.5 | 353.6 | 351.3 | 440.8 | 367.5 | 331.8 |
| Turbidity (NTU) | 5.3 | 11.1 | 9.6 | 8.7 | 5.0 | 4.2 | 7.4 | 13.9 | 15.7 | 10.3 | 12.1 | 7.6 | 11.4 | 7.4 |
| Chlorophyll a (μg/L) | 27.6 | 37.6 | 31.6 | 32.3 | 27.9 | 14.7 | 27.5 | 34.7 | 76.0 | 19.6 | 22.7 | 9.6 | 8.9 | 22.1 |
| Total Phosphorus as P (μg/L) | 25.9 | 55.0 | 51.2 | 44.0 | 49.1 | 56.4 | 41 | 39 | 51 | 32 | 156 | 35 | 45 | - |
| SRP as P (μg/L) | <11 | <11 | <11 | <11 | <8 | <9 | <1 | <1 | <1 | <1 | <1 | <1 | - | - |
| TKN (mg/L) | 1.2 | 1.6 | 0.6 | 1 | <0.5 | - | - | - | - | - | - | - | - | - |
| Total Dissolved Solids (g/L) | 0.2 | 0.2 | 0.2 | 0.2 | - | - | - | - | - | - | - | - | - | - |
| Total Nitrogen as N (mg/L) | - | - | - | - | - | 1.2 | 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) | <145 | <145 | 302.24 | <145 | <136 | <130 | <26 | <26 | 175 | 152 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | <PQL | <PQL | 8 | <PQL | <PQL | <130 | 4 | -9 | 28 | 8 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 3.03 | <0.4 | <0.4 | 1 | 1 | - | 1.57 | 0.47 | 0.51 | 1.15 | 0.13 | 1.08 | 4.00 | 0.25 |
| TN:TP ratio | - | - | - | - | - | 25 | 70 | 43 | 34 | 86 | 16 | 59 | 159 | - |
| pH | 8.7 | 9.1 | 7.9 | 8.5 | 8.6 | 8.7 | 8.7 | 9.0 | 8.7 | 7.5 | 8.5 | 8.5 | 8.5 | 7.1 |
| Alkalinity as CaCO3 (mg/L) | 119 | 93 | 92 | 101 | 110 | 116 | 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) | <7.6 | <7.6 | <7.6 | <7.6 | <6.4 | <6.2 | 4.04 | 4.20 | 6.69 | 3.15 | 6.58 | 3.42 | - | - |
| Inorganic Suspended Solids (mg/L) | <5 | 9 | <5 | <5 | <4 | 4 | 3 | 4 | 4 | 2 | 2 | 3 | 5 | 3 |
| Volatile Suspended Solids (mg/L) | <8 | 11 | 9 | <8 | <9 | <8 | 4 | 6 | 7 | 4 | 6 | 5 | 3 | 5 |
| Total Suspended Solids (mg/L) | <6 | 20 | 13 | 12 | 10 | 11 | 7 | 10 | 11 | 6 | 8 | 8 | 9 | 8 |
| Carlson Trophic State Index (Secchi)* | 54 | 66 | 66 | 61 | 67 | 56 | 56 | 60 | 61 | 52 | 55 | 51 | 55 | 61 |
| Carlson Trophic State Index (Chl a)* | 63 | 66 | 64 | 65 | 63 | 57 | 63 | 65 | 73 | 60 | 61 | 53 | 52 | 61 |
| Carlson Trophic State Index (TP)* | 51 | 62 | 61 | 59 | 60 | 62 | 58 | 57 | 61 | 54 | 77 | 56 | 59 | - |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |