Carman Bay (DNR ID: 27-0133-05)
Sampling Location - GPS Coordinates: Surface Area: 307 acres Max. Depth: 52 ft
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Carman 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. Next turn left at Shoreline Dr. Public boat launch is on the left.
Lake Minnetonka is a class 2B lake protected for aquatic life and recreation. Carman Bay was initially sampled by Three Rivers Park District in 2004. MCWD staff have been monitoring the site on Carman 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. An additional TP sample was taken one meter below the thermocline mixing zone once stratification developed.
| 2008 Summer Water Quality Summary |
| Parameters | Range | Mean | TSI Value | Lake Grade |
| Months | June - Sept. | May - Sept. | ||
| Secchi Depth (m) | 1.9 - 4.3 | 2.7 | 46 | B |
| Surface TP (µg/L) | 14 - 26 | 18.8 | 46 | A |
| Chlorophyll-a (µg/L) | 4 - 14 | 7.4 | 50 | A |
| Overall Score | 47 | A- |
The following summary refers to Figure 3.5 (a-d).
- From late April to the late June, secchi disk depth fluctuated between 2.4 m and 4.3 m. By early July, secchi disk depth decreased to 3 m and for the remainder of the season secchi disk depth fluctuated between 1.9 m to 2.9 m (standard > 1.2 m).
- Chlorophyll-a sample was not collected in April. From May to late July, chlorophyll-a concentrations decreased from 11 µg/L to 4 µg/L. By the middle of September, concentrations increased to 14 µg/L and then decreased to 9 µg/L by the end of the season (standard < 15 µg/L).
- Surface TP concentrations decreased from 24 µg/L to 14 µg/L by late June. TP con- centrations peaked twice throughout the remainder of the season: early July (22 µg/L) and late September (26 µg/L) (standard < 40 µg/L). Surface SRP concentrations remained below the detection limit (< 0.005 µg/L) except in late April (10 µg/L) and the middle of September (5 µg/L).
- Bottom TP concentrations peaked twice throughout the season: late July (280 µg/L) and the middle of September (979 µg/L). In the late season, TP concentrations declined below 80 µg/L. Bottom SRP concentrations were less than 35 µg/L for the majority of the season, with one exception when concentrations increased to 51 µg/L in the middle of September.
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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