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Flat Marshall County
Indiana Clean Lakes Program Survey Data
Lake Information
Lake Location: 7 miles west of PlymouthLatitude/Longitude: 41.19.738 N, 86.26.215 W
Lake Type: Glacial Lake
Surface Area: 9 ha (22 acres)
Maximum Depth: 6 m (20 ft)
Lake Access: Public
Ramp Type: Dirt
Volunteer Survey Data
Flat Lake has been sampled by volunteers 13 years. The volunteer collected Secchi data is listed below:
| Sample Date | Sample Time | Secchi Depth (ft) | Chlorophyll-a (ug/L) | Total Phosphorus (ug/L) |
|---|---|---|---|---|
| 1990-05-28 | 11:30 am | 5.50 | ||
| 1990-06-17 | 1:45 | 6.75 | ||
| 1990-07-01 | 2:30 | 5.50 | ||
| 1990-07-17 | 3:00 | 6.75 | ||
| 1990-08-01 | 3:15 | 6.50 | ||
| 1990-08-16 | 2:30 | 5.75 | ||
| 1990-09-02 | 1:00 | 5.00 | ||
| 1990-09-17 | 12:45 | 4.50 | ||
| 1990-09-30 | 2:45 | 6.50 | ||
| 1990-10-13 | 1:15 | 8.75 | ||
| 1990-10-29 | 3:00 | 6.25 | ||
| 1991-04-26 | 1:00 | 7.75 | ||
| 1991-05-11 | 3:00 | 5.50 | ||
| 1991-05-28 | 1:05 | 4.50 | ||
| 1991-06-18 | 12:00 | 5.00 | ||
| 1991-06-30 | 1:50 | 7.00 | ||
| 1991-07-15 | 11:45 | 7.00 | ||
| 1991-08-15 | 1:45 | 8.75 | ||
| 1991-09-07 | 12:45 | 7.00 | ||
| 1991-09-23 | 1:30 | 7.25 | ||
| 1991-10-07 | 1:20 | 5.75 | ||
| 1992-05-28 | 2:00 | 5.75 | ||
| 1992-07-19 | 2:30 | 4.25 | ||
| 1992-08-05 | 2:35 | 5.25 | ||
| 1992-08-19 | 3:00 | 5.75 | ||
| 1992-09-13 | 1:00 | 6.50 | ||
| 1993-05-16 | 1:30 | 4.25 | ||
| 2009-05-11 | 2:00:00 PM | 4.40 | 1.33 | 67.00 |
| 2009-06-24 | 10:00:00 AM | 3.70 | 9.21 | 86.00 |
| 2009-07-14 | 11:00:00 AM | 4.60 | 11.35 | 73.00 |
| 2009-08-10 | 2:00:00 PM | 6.20 | 5.29 | 63.00 |
| 2010-05-15 | 11:26:00 AM | 4.40 | 2.32 | 30.50 |
| 2010-06-07 | 11:45:00 AM | 6.00 | 34.49 | 88.00 |
| 2010-07-11 | 9:45:00 AM | 6.20 | 9.61 | 64.00 |
| 2010-07-11 | 9:30:00 AM | 7.80 | ||
| 2010-08-17 | 9:30:00 AM | 7.80 | 8.97 | 64.00 |
| 2011-05-31 | 10:00 AM | 4.5 | 17.43 | 90.0 |
| 2011-06-15 | 2:15 PM | 3.7 | 8.65 | 83.0 |
| 2011-07-26 | 10:45 AM | 3.9 | 22.88 | 33.0 |
| 2011-08-21 | 1:00 PM | 4.2 | 38.63 | 33.0 |
| 2012-05-29 | 2:30 PM | 5.2 | 10.17 | 49 |
| 2012-06-25 | 10:00 AM | 4 | 22.73 | 69 |
| 2012-07-23 | 10:15 AM | 4.1 | 24.11 | 53 |
| 2012-08-06 | 11:30 AM | 4.1 | 9.64 | 46 |
| 2013-05-31 | 3:00 PM | 4.9 | 15.54 | 42 |
| 2013-06-27 | 10:45 AM | 3.2 | 25.26 | 63 |
| 2013-07-29 | 12:00 PM | 4.4 | 73 | |
| 2013-08-27 | 9:30 AM | 4.5 | 17.89 | 56 |
| 2014-05-21 | 11:00 AM | 5.5 | 14.32 | 35.75 |
| 2014-06-30 | 10:30 AM | 4.2 | 19.89 | 71.5 |
| 2014-07-23 | 10:30 AM | 4.7 | 30.8 | 73.3 |
| 2014-08-27 | 10:15 AM | 3.4 | 30.44 | 92.42 |
| 2015-05-18 | 10:00 AM | 5.2 | 10.2 | 53 |
| 2015-06-23 | 11:45 AM | 2.7 | 9.54 | 84.1 |
| 2015-07-27 | 10:15 AM | 3.9 | 29.7 | 69.3 |
| 2015-08-11 | 10:45 AM | 4.1 | 52 | 90.7 |
| 2016-05-20 | 12:00 PM | 3.5 | 45 | |
| 2016-06-14 | 11:00 AM | 3.3 | 16.70 | 62 |
| 2016-07-30 | 11:30 AM | 3.0 | ||
| 2016-07-30 | 11:30 AM | 3.0 | 20.10 | 47 |
| 2016-08-25 | 11:00 AM | 4.2 | ||
| 2016-08-25 | 11:00 AM | 4.2 | 33.40 | 75 |
| 2017-05-26 | 10:00 AM | 4.1 | 13.53 | 48 |
| 2017-06-13 | 9:30 AM | 4.6 | 20.69 | 70 |
| 2017-07-31 | 24.09 | 52 | ||
| 2017-08-08 | 10:30 AM | 3.6 |