Ambient Lake Monitoring
The Ambient Lake Monitoring program samples lakes in Iowa over the summer recreational season. Each lake is sampled three times between May and September: once in early summer, once in mid-summer, and once in late summer/early fall. Data from this project are used to assess the health of our lakes and target individual lakes for restoration and watershed improvement activities. Monitoring is currently completed through a partnership with the Iowa State University Limnology Laboratory.
Current Ambient Lake Sites
| SiteID | Site | County |
|---|
Lake Water Quality Summary 2008 to 2018
Summary statistics last calculated 12/11/2018 10:16:41 AM
| Analyte | Units | # Results | Min | 10th Percentile | 25th Percentile | Median | 75th Percentile | 90th Percentile | Max | Max Sample Date | % Non-detection |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Ammonia | mg/l | 3,108 | <0 | <0 | <0.001 | 0.004 | 0.01 | 0.016 | 0.433 | 7/17/2017 | 27.12 |
| Ammonia-nitrogen | mg/l | 4,276 | Not calculated when non-detections exceed 50% | 50.35 | |||||||
| Calcium carbonate | mg/l | 2,796 | 9 | 83.905 | 99.1425 | 128.875 | 165 | 197 | 485 | 8/6/2018 | 0.00 |
| Chlorophyll a | ug/l | 3,943 | <0.4 | <4 | 8.365 | 23 | 46 | 80 | 416.96 | 8/18/2014 | 10.63 |
| Depth, Secchi disk depth | m | 4,222 | 0.1 | 0.3 | 0.5 | 0.7 | 1.3 | 2.4 | 10 | 7/21/2015 | 0.00 |
| Dissolved oxygen (DO) | mg/l | 4,210 | 0.8 | 5.6 | 7.2 | 8.8 | 10.6 | 12.7 | 30.2 | 5/23/2011 | 0.00 |
| Dissolved oxygen saturation | % | 3,560 | 9.1 | 65.89 | 84.0975 | 102.75 | 123.6 | 150.805 | 313.8 | 6/21/2010 | 0.00 |
| Escherichia coli | MPN | 236 | <1 | <1 | <1 | 2 | 5.2 | 13.5 | 410.6 | 9/20/2017 | 30.93 |
| Fixed suspended solids | mg/l | 4,275 | <0.6 | <1.4 | <3 | 4.3 | 8 | 15 | 378 | 5/31/2011 | 32.77 |
| Inorganic nitrogen (nitrate and nitrite) | mg/l | 4,276 | Not calculated when non-detections exceed 50% | 62.91 | |||||||
| Kjeldahl nitrogen | mg/l | 3,884 | <0.16 | 0.5 | 0.8346625 | 1.21 | 1.77 | 2.42 | 12.92 | 8/8/2011 | 6.82 |
| Microcystin | ug/l | 757 | Not calculated when non-detections exceed 50% | 69.88 | |||||||
| Orthophosphate | mg/l | 4,268 | Not calculated when non-detections exceed 50% | 69.80 | |||||||
| pH | None | 4,219 | 6.7 | 7.8 | 8.1 | 8.4 | 8.7 | 8.95 | 10.4 | 8/6/2009 | 0.00 |
| Phosphate-phosphorus | mg/l | 4,248 | <0.01 | 0.0284 | 0.0452 | 0.07715 | 0.13025 | 0.2147 | 1.0519 | 7/25/2017 | 1.91 |
| Phycocyanin | ug/l | 798 | <0 | <3.3 | 7 | 18 | 51 | 116.6 | 1016 | 7/31/2018 | 24.31 |
| Specific conductance | uS/cm | 4,225 | 0.202 | 210 | 260 | 350 | 450 | 550 | 1091 | 8/27/2018 | 0.00 |
| Temperature, water | deg C | 4,225 | 10.34 | 18.4 | 21.4 | 23.9 | 26 | 27.4 | 31.7 | 8/3/2010 | 0.00 |
| Total dissolved solids | mg/l | 3,449 | 45 | 140 | 170 | 222 | 300 | 360 | 709 | 8/27/2018 | 0.00 |
| Total suspended solids | mg/l | 4,275 | <0.8 | 4 | 6.6 | 11.8 | 19.5 | 32 | 452 | 5/31/2011 | 7.93 |
| Turbidity | NTU | 4,064 | <0 | 2.079 | 5.2 | 11.2 | 21.6 | 39 | 462.5 | 6/3/2013 | 0.94 |
| Volatile Suspended Solids | mg/l | 3,067 | <0 | <3 | <5.6 | 8 | 11.4 | 18 | 130 | 7/22/2013 | 28.14 |
Project Codes in this Program
| Project Type | Description |
|---|
Program Details
| Results (2008 to 2018) | 76,381 |
| Sites |
Additional Summary Calculations
| Parameter | Value |
|---|---|
| TSI (ChlA) | 65 |
| TSI (Secchi) | 59 |
| TSI (TP) | 71 |