Wayzata Bay (DNR ID: 27-0133-02)
Sampling Location GPS Coordinates: Surface Area: 751 acres Max. Depth: 63 ft
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Wayzata Bay is located in Wayzata. Head east on Minnetonka Blvd, and turn left on Co Rd 101 S. Turn right at Grays Bay Blvd and enter the Grays Bay Marina and public access on the left side of the road.
Wayzata Bay is on Lake Minnetonka which is a class 2B lake protected for aquatic life and recreation. Water quality information is available beginning in 1997. MCWD staff have been monitoring the site on Wayzata Bay 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 late April 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 and bottom sample parameters analyzed included total phosphorus (TP), total dissolved phosphorus (TDP), soluble reactive phosphorus (SRP), total nitrogen (TN), total dissolved nitrogen (TDN), nitrate/nitrite (NO3/NO2) and ammonia (NH4). Surface concentrations of chlorophyll-a were also analyzed and measurements of Secchi disc depth were recorded.
| 2008 Summer Water Quality Summary |
| Parameters | Range | Mean | TSI Value | Lake Grade |
| Months | June - Sept. | May - Sept. | ||
| Secchi Depth (m) | 2.9 - 4.9 | 3.7 | 41 | A |
| Surface TP (µg/L) | 10 - 24 | 16.4 | 45 | A |
| Chlorophyll-a (µg/L) | 3 - 10 | 4.3 | 45 | A |
| Overall Score | 43 | A |
The following summary refers to Figure 3.51 (a-d).
- Secchi disk depth decreased from 3.4 m to 2.7 m by late May then increased to 4.9 m in early June. The rest of the season secchi disk depth fluctuated between 2.9 m and 4.5 m (standard > 1.2 m).
- Chlorophyll-a concentrations increased from 8 µg/L to 11 µg/L by late May then remained between 3 µg/L to 5 µg/L until late September. Cholorphyll-a concentrations increased to 10 µg/L by late September and then declined slightly in October (standard < 15 µg/L).
- Surface TP concentrations were below the standard limit for the entire season (< 40 µg/L) and fluctuated between 10 µg/L and 27 µg/L. Surface SRP concentrations were below detection limit (< 0.005 µg/L) except in late April (10 µg/L).
- Bottom TP concentrations decreased from 22 µg/L to 15 µg/L from late April to late May, then increased to 269 µg/L by early September. TP concentrations increased again by late September (381 µg/L) and then declined to 19 µg/L in October. Bottom SRP concentrations peaked four times throughout the season: late April (11 µg/L), early July (15 µg/L), early September (25 µg/L) and late September (30 µg/L).
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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