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.
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 - 2.3 | 0.9 | 62 | C |
| Surface TP (µg/L) | 80 - 131 | 102.6 | 71 | D |
| Chlorophyll-a (µg/L) | 14 - 141 | 82.0 | 74 | D |
| Overall Score | 69 | D+ |
The following summary refers to Figure 3.17 (a-d).
- Secchi disk depth increased from 0.9 m to 4.5 m from late April to the late May. It then gradually decreased to 0.7 m by early July. The rest of the season secchi disk depth ranged between 0.4 m and 0.7 m (standard > 1.2 m).
- Chlorophyll-a concentrations decreased from 100 µg/L to 1 µg/L from late April to late May, then increased to 128 µg/L by late July. Chlorophyll-a concentrations fluctuated the remainder of the season with a maximum concentration of 141 µg/L occurring in early September (standard < 15 µg/L).
- In late April, surface TP concentrations were 116 µg/L, and then peaked in late July (106 µg/L) and again in the middle of September (131 µg/L) (standard < 40 µg/L). Surface SRP concentrations increased from 7 µg/L to 57 µg/L throughout May, then for the rest of the season ranged between < 0.005 µg/L and 8 µg/L.
- Bottom TP concentrations fluctuated in the beginning of the season then increased to 1020 µg/L by late August*. From September to October, TP concentrations ranged between 112 µg/L and 136 µg/L. Bottom SRP concentrations followed a similar pattern. *Late July SRP concentration was greater than TP which may be due to silica interference within the SRP sample. Further research is needed to confirm interference (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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