Phelps Bay (DNR ID: 27-0133-05)
Sampling Location - GPS Coordinates: Surface Area: 394 acres Max. Depth: 30 ft
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Phelps Bay is located near the cities of Spring Park and Mound. Head east on Minnetonka Blvd, and turn right on Co Rd 101 S. Turn right MN-7 and turn right on Oak St. Oak St. merges into Smithtown Rd and continue onto Manitou Rd/Shadywood Rd. Take a slight left to stay on Manitou Rd/Shadywood Rd. Next turn left at Shoreline Dr. Public boat launch is on the left.
Phelps Bay is on Lake Minnetonka which is a class 2B lake protected for aquatic life and recreation. Secchi disk depth information is available, but complete water quality monitoring did not begin until 1996. MCWD staff have been monitoring the site on Phelps 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) | 1.7 - 4.0 | 2.6 | 46 | B |
| Surface TP (µg/L) | 16 - 26 | 21.4 | 48 | A |
| Chlorophyll-a (µg/L) | 4 - 12 | 7.2 | 50 | A |
| Overall Score | 48 | A- |
The following summary refers to Figure 3.37 (a-d).
- Secchi disk depth was about 2 m in the beginning of the season and then increased to 4 m by late June (standard > 1.2 m). The remainder of the season there was an overall decrease in secchi disk depth ranging between 1.7 m and 2.7 m.
- Chlorophyll-a concentrations fluctuated from late April to early June with the maximum concentration reached in early May (14 µg/L). Concentrations ranged between 4 µg/L and 8 µg/L until the middle of September when chlorophyll-a increased to about 12 µg/L (standard < 15 µg/L).
- Surface TP concentrations were below the standard limit for the entire season (< 40 µg/L) and fluctuated between 16 µg/L and 26 µg/L. Surface SRP were below detection limit (< 0.005 µg/L) for the entire season.
- Bottom TP concentrations fluctuated between 16 µg/L and 30 µg/L except in early August when concentrations rose to 109 µg/L. Surface SRP were below detection limit (< 0.005 µg/L) except in late May, late July and early August.
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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