Toolik Lake Main Station

Lake Details


Toolik Lake has undergone no manipulation. It has been monitored since 1975 and serves as a reference lake for several whole lake ecosystem manipulations.

Lake Description

Toolik Lake is a deep kettle lake located on the North Slope of Alaska (68.3oN, 149.36oE). It is oligotrophic (annual production of 12g C/m2), stratifies with surface temperatures up to 18oC, and is ice-free from July through September. The surface temperature may reach 18oC, but the volume weighted summer temperature is 10-14oC (Miller et al. 1986). Toolik Lake is dimictic despite its northern location. Ice cover, which may reach 1.4m thick, forms in early October. Toolik Lake typically stratifies in late June or early July when the thermocline is located at 5-7m and mixes in late August.

Elevation (m): 719

Surface Area (ha): 150

Volume (cubic meters): 10,566,000

Mean Depth (m):

Max Depth (m):

Catchment Area (ha): 6688

Water Retention Time (years): 1.0


Arctic Grayling (Thymallus arcticus)

Slimy sculpin (Cottus cognatus)

Lake Trout (Salvelinus namaycush)

Round White fish (Prosopium cylindraceum)

Burbot (Lota lota)


Keratella cochlearis

Keratella quadrata

Kellicottia longispina

Polyarthra vulgaris

Chromogaster ecaudis

Conochilus unicornis

Filinia longiseta


Daphnia middendorffiana

Heterocope septentrionalis

Holopedium gibberum

Daphnia longiremis

Bosmina longirostris

Diaptomus pribilofensis

Cyclops scutifer


Datasets at this location