Kolk (vortex)
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A kolk is an underwater vortex causing hydrodynamic scour by rapidly rushing water past an underwater obstacle. High-velocity gradients produce a high-shear rotating column of water, similar to a torn
One of many kolk-formed depressions or "potholes" in the channeled scablands in eastern Washington at 46°54′21.40″N 119°16′47″W / 46.9059444°N 119.27972°W / 46.9059444; -119.27972.
Kolk from the 1717 Christmas flood in Horumersiel (de: Horumersiel) with information board
Sprague Lake (Washington)
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Sprague Lake is a lake in Washington, straddling the border of Adams and Lincoln counties. It is two miles west of the town of Sprague. Sprague Lake is drained by Cow Creek, a tributary of the Palouse
Kolk (vortex)
…The region below Dry Falls includes a number of lakes scoured out by kolks. Sprague Lake is a kolk-formed basin created by a flow estimated to be 8 miles (13 km) wide and 200 feet (60 m) deep. The Alberton Narrows on the Clark Fork River…
Aerial view of Lincoln County, WA with Sprague Lake in the lower right corner.