Spring Park Bay (DNR ID: 27-0133-05)
Sampling Location GPS Coordinates: Surface Area: 402 acres Max. Depth: 36 ft
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Spring Park Bay is located in Spring Park. 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.
Spring Park 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 Spring Park Bay on a bi-weekly basis from the time of ice out (April) to the time of fall mixing (mid-October) since 2006.
See Previous Reports.
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. Additionally, water samples were collected within the first two meters of the surface with a 2-meter composite sampling tube. Samples one meter above the bottom were collected with a Van Doran water sampler. Surface sample were analyzed for total phosphorus (TP), soluble reactive phosphorus (SRP), total nitrogen (TN), where the bottom samples were analyzed for TP and SRP. Surface concentrations of chlorophyll-a were also analyzed and measurements of Secchi disc depth were recorded.
| 2009 Summer Water Quality Summary |
| Parameters | Range | Mean | TSI Value | Lake Grade |
| Months | June - Sept. | May - Sept. | ||
| Secchi Depth (m) | 1.8 - 4.1 | 2.8 | 45 | B |
| Surface TP (µg/L) | 15 - 29 | 20.7 | 48 | A |
| Chlorophyll-a (µg/L) | 3 - 14 | 6.9 | 50 | A |
| Overall Score | 48 | A- |
The following summary refers to Figure 3.45 (a-d).
- Secchi disk depth increased from 2.8 m to 4.2 m by late May. From early June to early August, Secchi disk depth fluctuated between 2.5 m and 4.1 m with the maximum depth occurring in early August. From late August to late September, Secchi disk depth declined to 1.8 m and then increased to 2.9 m in early October (standard > 1.4 m).
- Chlorophyll-a concentrations decreased from 5 μg/L to 2 μg/L by late May, and then fluctuated between 4 μg/L and 5 μg/L until early August. In August, concentrations increased to 8 μg/L, and then increased to 13.5 μg/L by early October (Standard < 14
μg/L). - Surface TP concentrations were below the standard limit for the season (< 40 μg/L). TP concentrations fluctuated between 15 μg/L and 19 μg/L from late April to late July. The rest of the season, TP concentrations increase slightly ranging between 22 μg/L and 29 μg/L. Surface SRP concentrations were below detection limit (< 0.005 μg/L) for the entire season.
- Bottom TP concentrations decreased from 33 μg/L to 14 μg/L by early May and then for the rest of the season, concentration fluctuated between 16 μg/L and 27 μg/L. Bottom SRP concentrations were below detection limit (< 0.005 μg/L) except in early July (20 μg/L).* *The presence of silica may be the reason for elevated SRP concentration in
early July (email correspondence; RMB, 2008).
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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