Halsted Bay (DNR ID: 27-0133-09)
Sampling Location GPS Coordinates: Surface Area: 544 acres Max. Depth: 36 ft
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Halsted Bay is located near the cities of Excelsior and Minnetrista. Head east on Minnetonka Blvd, and turn right on Co Rd 101 S. Turn right MN-7 and turn right at Hwy 44. Next turn left onto Country Hwy 110 and then take a left onto Halstead Drive. The public boat launch is located at the first right elbow in the road with parking available on the roadside.
Lake Minnetonka is a class 2B lake protected for aquatic life and recreation. Halsted Bay is connected to Lake Minnetonka by channel and is adjacent to Priests Bay. Water quality information is available beginning in 1996. MCWD staff have been monitoring the site on Halsted 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) | 0.3 - 0.9 | 0.6 | 68 | D |
| Surface TP (µg/L) | 68 - 138 | 104.1 | 71 | D |
| Chlorophyll-a (µg/L) | 26 - 127 | 76.6 | 73 | D |
| Overall Score | 71 | D+ |
The following summary refers to Figure 3.17 (a-d).
- Secchi disk depth increased from 1.1 m to 3.6 m from late April to the early May, and
then gradually decreased to 0.3 m by late August. The rest of the season secchi disk depth
increased to 2.3 m (standard > 1.4 m). - Chlorophyll-a concentrations decreased from 33 μg/L to 3 μg/L from late April to early
May, then increased to 127 μg/L by early August. Chlorophyll-a concentrations declined
for the remainder of the season (standard < 14 μg/L). - Surface TP concentrations fluctuated throughout the season. In late April, surface TP
concentrations were 104 μg/L, and then peaked in early June (138 μg/L) and again in the
middle of September (116 μg/L) (standard < 40 μg/L). Surface SRP concentrations
increased from <0.005 μg/L to 30 μg/L from late April to late May, then for the rest of
the season ranged between < 0.005 μg/L and 38 μg/L. - Bottom TP and SRP concentrations gradually increased from late April to late July (TP =
900 μg/L; SRP = 410 μg/L). TP and SRP concentrations declined in August, and then
increased to a second peak in late September (TP = 639 μg/L; SRP = 484 μg/L). Both
components of phosphorus declined at the end 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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