Jennings Bay (DNR ID: 27-0133-15)
Sampling Location GPS Coordinates: Surface Area: 290 acres Max. Depth: 26 ft
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Jennings Bay is located near the city of Mound. Head east on Minnetonka Blvd and turn left on Co Rd 101 S. Turn right at Grays Bay Blvd and continue on Bushaway Rd. Turn left on Eastman Ln/Shady Ln, then a slight right at E Circle Dr. Take a slight left at Lake St. E. Turn left at Ferndale Rd S and continue on Shoreline Dr. Turn right at Northshore Dr. North Arm public boat access is located off of Northshore Drive two miles west from Shoreline Drive.
Jennings Bay is on Lake Minnetonka which is a class 2B lake protected for aquatic life and recreation. Water quality information is available beginning in 1996. MCWD staff have been monitoring the site on Jennings 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) | 0.4 - 2.0 | 0.9 | 62 | D |
| Surface TP (µg/L) | 63 - 154 | 107.1 | 72 | D |
| Chlorophyll-a (µg/L) | 19 - 141 | 72.1 | 73 | D |
| Overall Score | 69 | D |
The following summary refers to Figure 3.21 (a-d).
- Secchi disk depth increased from 0.8 m to 2.7 m by late May. The rest of the season there was an overall decline in secchi disk depth ranging from 0.4 m to 2 m (standard > 1.2 m).
- Chlorophyll-a concentrations decreased from 70 µg/L to 19 µg/L from late April to late June. Concentrations increased to 141 µg/L by early September then declined to 99 µg/L by late September. In October, chlorophyll-a concentrations increased slightly (standard < 15 µg/L).
- Surface TP concentrations decreased from 117 µg/L to 64 µg/L in the beginning of the season. An overall increase occurred from late May to October with TP concentrations reaching a maximum (173 µg/L) in October (standard < 40 µg/L). Surface SRP con-centrations were below detection limit (< 0.005 µg/L) except from late April to early June and from late September to October.
- Bottom TP concentrations declined in the beginning of the season then increased to 616 µg/L by late July. Concentrations ranged between 150 and 161 µg/L from September to October. Bottom SRP concentrations increased to 334 µg/L by early July. From late July to late August, SRP concentrations declined to less than 0.005, and then increased to 24 µg/L by October.
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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