Water Quality Testing - RMB Labs

RMB Environmental Labs, Inc. performs the testing of our samples. Samples are taken from three sites on the lake five times during the open water season. The sites are designated as main lake (203), west bay (206) and south end(207). Collections are taken on Sunday afternoons for delivery to the pick up site on Monday morning.

RMB's website has all the information on the results of the testing from a one page summary to indepth details depending upon what you want to look at.

To go to their site click here.

Below is a one page summary of the 2007 to 2012 time frame and a info on long term trends.

Water Quality Characteristics

Years monitored: 2007 - 2012  (RMB database only)

*RMB note: Before 2011, the reporting limit for total phosphorus was 5 ug/L. Starting in 2011, the reporting limit is 3 ug/L.

203 (Primary)
Total Phosphorus Mean (ug/L): 11.6 9.3 12.2
Total Phosphorus Min (ug/L): 7.0 7.0 9.0
Total Phosphorus Max (ug/L): 20.0 14.0 18.0
Number of Observations: 28 15 15
Chlorophyll-a Mean (ug/L): 4.2 2.5 5.0
Chlorophyll-a Min (ug/L): 1.0 1.0 1.0
Chlorophyll-a Max (ug/L): 8.0 4.0 20.0
Number of Observations: 27 15 15
Secchi Depth Mean (ft): 13.6 15.0 12.7
Secchi Depth Min (ft): 9.0 10.0 7.0
Secchi Depth Max (ft): 19.0 19.5 17.5
Number of Observations: 26 15 14
Long-term Trends
Primary site only. Recommend minimum of 8-10 years of data with 4+ readings per season. Minimum confidence accepted by MPCA is 90%
Total Phosphorus: No significant trend exists.
Chlorophyll-a: No significant trend exists.
Secchi Depth: No significant trend exists.
Trophic State Index: No significant trend exists.
EcoRegion Comparisons
(Primary site only. Comparisons are based on interquartile range, 25th - 75th percentile, for ecoregion reference lakes)
Total Phosphorus: Below Expected Range
Chlorophyll-a: Within Expected Range
Secchi Depth: Within Expected Range

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DNR fisheries seeks comments on Sand, Tamarack lake management plans

The Minnesota Department of Natural Resources Duluth area fisheries is seeking comments through Friday, March 16 on updated lake management plans for Sand and Tamarack lakes in Carlton County. “Management plans describe the past, present and desire...

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