8.3.2   15823 Sherbrooke Rd

Spring Creek at Sherbrooke sampling site is a series of 3 circular steel culverts. These culverts were installed in winter of 2006-2007. Previously, this sampling site was a single steel culvert. Calculator Spring Creek at Sherbrooke is a series of 3 circular steel culverts. view calculator Total Phosphorous TP levels appear to have remained steady at in Spring Creek over the past few years. As is typical with streams in Minnesota, the spring thaw combined with spring rains produces the highest phosphorus loading of the year (see graph). 2007 loading was a little higher than previous years, but this is probably due to the new culvert construction. Some of the soil around the culvert washed into Spring Creek during spring thaw and caused higher than normal phosphorus loading. Spring Creek at Sherbrooke loads 0 to 25 lbs TP per day. see graphs Chlorophyll A ChlA concentration (algae) at the Sherbrooke culvert ranges from 0 to 0.1 ug/L. This concentration is extremely low. Algae grows better in calm water than flowing water. For comparison, the ChlA concentration in Pelican Lake ranges from 4-12 ug/L. Because of the low concentration of chlorophyll-a detected in Spring Creek from 2002-2006, this test was dropped from analysis in 2007. see graphs

Fecal Coliform

Fecal Coliform bacteria concentrations range from 0 - 150 colonies/100mL. This concentration is fairly low and does not pose a health risk to Pelican Lake. The two peaks in concentration (shown on the graph) were from non-typical rain events totaling 2.5 - 3.5 inches.

Because of the typical low fecal coliform bacteria numbers in Spring Creek from 2002-2006, and the lack of direct possible sources of bacteria adjacent to the creek, this test was dropped from analysis in 2007. see graphs

Total Suspended Solids

TSS concentration at the Sherbrooke culvert typically ranges from 0 to 50 mg/L. Higher concentrations are observed here because of the rapids like nature of the stream before the culvert. Typical loading is around 0 to 1000 lbs per day, with loading up to 8000 lbs per day during heavy rain. In spring of 2007, TSS levels were higher because of the construction of the new culvert. see graphs

Flow

Flow through the culverts at 15823 Sherbrooke Road is constant throughout the year with the highest flow in the spring. This pattern is typical for Minnesota streams. As the snow melts, it runs into the streams causing higher water levels and flow. Flow at this site on Spring Creek ranges from 1 to 45 cfs of water. see graphs

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