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GRINDSTONE LAKE
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  Grindstone Lake
GRINDSTONE LAKE ID 58-0123 Pine County @ SandStone, MN
Morohometry

Elevation = ~305 km (1100' MSL)

Ao = 216 ha (533 acres)

Aw = 4968 ha (12,271 acres)

Zmax = 46.6 m (153 ft)

Zmean = 21.7 m (71.3 ft)

V = 46.95 x 106 m3

Aw:Ao = 23 : 1

Shoreline = 7.84 km (4.87 mi)

Littoral area = 13.4%

HRT = ~4 years

Watershed

1% Urban

48% Wetland/Water

27% Forest

17% Cultivated

7% Pasture/Open

Water quality

Summer Epilimnion
(2000 means, ±sd, range)

Secchi = 4.0 ± 0.9 m
Chlorophyll a = 3 ± 1.6 ppb (2.1 - 6.1 ppb)
TP = 9 ± 3 ppb (7 - 11 ppb)
NO3-N = ppb
NH4-N = 18 ppb (n = 1)
TN = 405 ± 6 ppb (401 and 409 ppb)
Alkalinity = 48 (low, but not acid sensitive)
pH = 7.5 - 8.6
EC = 95 µS/cm
Color = 33 Pt-Co units

Summer Hypolimnion
(2000 means, ±sd, range)

TP = 11 ± 3 ppb (8-14ppb)
NO3-N = 150 ppb (1 datum)
TN = 454 ± 30 ppb (430-487ppb)

Shoreline cabins

1993
43 permanent
63 seasonal
none sewered

Misc

Stratified in summer; remains oxic (~5 ppm DO) as deep as 33 m

Fishery
2 story

1st Warm Water
Bullheads
centrarchids
Northern Pike

2nd Cold Water
Trout

 

Trophic status (Carlson TSI)

45 (mesotrophic)

 

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http://www.waterontheweb.org/data/grindstone/context/summary.html
date last updated: Tuesday March 09 2004