Gleason Lake (DNR ID: 27-0095-14) MCWD Site ID: LGL01 Sampling Location - GPS Coordinates: Surface Area: 142 acres Max. Depth: 16 ft
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Gleason Lake is located in the city of Plymouth. There is currently no public access on the lake. The lake is located north of US Hwy 12 at Hwy 101 south, in Wayzata.
Gleason Lake is a polymictic class 2B lake protected for aquatic life and recreation. Limited water quality information is available beginning in 1975, but regular seasonal sampling did not begin until 1997. MCWD staff have been monitoring the lake on a bi-weekly basis from the time of ice out (April) to the time of fall mixing (mid-October) since 2006.
Currently not available.
Monitoring season started in early May and ended in late October. A YSI multi-probe sonde was used to measure dissolved oxygen (DO), temperature (oC), pH, and specific conductivity (µS/cm) at each meter depth from the water surface to the bottom. Water samples were collected at one meter below the water surface and one meter from the bottom. Surface sample parameters analyzed included total phosphorus (TP), total nitrogen (TN), and soluble reactive phosphorus (SRP). Surface concentrations of chlorophyll-a were also analyzed and measurements of Secchi disc depth were recorded. Bottom samples were analyzed for TP and SRP.
| 2008 Summer Water Quality Summary |
| Parameters | Range | Mean | TSI Value | Lake Grade |
| Months | June - Sept. | May - Sept. | ||
| Secchi Depth (m) | 0.45 - 2.9 | 1.1 | 58 | C |
| Surface TP (µg/L) | 30 - 170 | 95.6 | 70 | D |
| Chlorophyll-a (µg/L) | 4 - 146 | 69.4 | 72 | D |
| Overall Score | 67 | D+ |
The following summary refers to Figure 12.3 (a-d).
- Secchi disk depth fluctuated around 2 m in the beginning of the season. In June, water clarity decreased with secchi disk depth remaining around 0.45 m from mid-July through early September (standard >1.2 m). Late September, water clarity began to increase with secchi disk depth reaching a maximum for the season of 3.7 m late October.
- Chlorophyll-a concentrations were below the standard limit (< 15 µg/L) until July when concentrations increased to 146 µg/L. Throughout the rest of the season concentrations decreased only peaking once more at the end of August (124 µg/L).
- Throughout May to August, surface TP concentrations gradually increased to 170 µg/L, the highest concentration of the season. From late August to October, TP concentrations decreased, but remained above the standard limit (< 40 µg/L). Surface SRP concentrations ranged from below detection limit to 19 µg/L.
- Both bottom TP and SRP concentrations followed similar patterns as their surface counterparts. TP concentrations peaked in July (221 µg/L), then gradually decreased for the remainder of the season.
Lake Grades and Historical Monitoring Summaries
When available, previous reports are linked to applicable year. Additional lake data previous to 2007 may be available in the applicable year's hydrodata report. If you have additional questions or you are looking for specific information please contact MCWD's Water Quality Staff.
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