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Oak Lake Attributes

oaklake map

Oak Lake is a prairie pothole formed approximately 14,000 years ago following recession of glacial ice sheets. Major attributes of the Oak Lake landscape, drainage basin and lake basin are listed in the tables below. Lake monitoring is conducted by field station staff biweekly during the ice-free months (April to October). Monitoring data for the lake basin are available upon request from the Field Station Director.

Region, Drainage and Basin

EPA Level III Ecoregion Northern Glaciated Plains
EPA Level IV Ecoregion Prairie Coteau
Drainage System Minnesota-Mississippi
Drainage Area 1,682 ha
Drainage Count 99
Drainage Density 1.9 streams km per km2
Basin Area 163 ha
Basin Perimeter 9.8 km
Basin Volume 1.8 x 106 m3
Average Depth 1.1 m
Maximum Depth 2.0 m
Basin Length 3,081 m
Basin Width 988 m
Shoreline Development 2.17
% Basin < 1.5 m Deep 73%

 

 

 

Average Growing Season Water Quality Characteristics (1994-Present)

Attribute Summer Averages Summer Ranges
Trophic Status Hypereutrophic --
Carlson Trophic State Index (Chl) 60.1 11-79
Secchi Depth 47 cm 5 - 200
Water Temperature 18.4°C 1.0 – 30.0
Dissolved Oxygen 9.6 mg/L 2.5 – 17.2
pH (Median and Range) 8.48 6.56 – 9.40
Specific Conductance 496 uS/cm 207 - 778
Total Dissolved Solids 400 mg/L 139 - 2427
Fecal Coliform Levels % > 200/100ml = 3.1% Value Range <10 - 180