Cast Gill

Island Lake

Marinette County, Wisconsin · WBIC 614900

Official regulationsDNR lake map

The DNR lists this lake's watershed (Menominee River) as suspect or infected with VHS, a fish virus. The listing covers the watershed, not a test of this lake. About VHS

Size

81 acres

Max depth

42 ft

DNR lake type

Simple, Warm, dark water color

Water clarity

9 ft

Moderate, measured Sep 1993

A warm-water lake type: the DNR groups it with lakes that warm up through summer. This describes the lake type in general, not this lake in particular.

Outline

Drawn from the DNR's 24K hydrography (surveyed 1982), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.

Water clarity

9 ft Secchi depthModerateOlder reading

Last measured Sep 4, 1993. 46 readings on record, 1988 to 1993.

Nothing has been measured in the last 5 years, so this may not match the lake today.

Secchi depth is how far down a white disk stays visible. A bigger number means clearer water. Clear means a Secchi depth of 10 feet or more, moderate 5 to 10 feet, low under 5 feet.

Wisconsin DNR water monitoring (volunteer and staff), via the Water Quality Portal; station ISLAND LAKE - DEEP SPOT. Checked Oct 23, 2026.

Water temperature

A typical year Modeled estimate

  • Ice goes outabout Apr 8 (Apr 2 to Apr 19)
  • Surface reaches 48°Fabout Apr 21 (Apr 15 to Apr 29)
  • Surface reaches 64°Fabout May 11 (May 7 to May 20)
  • June surface73°F, usually 72 to 75°F
  • July surface79°F, usually 78 to 80°F
  • August surface75°F, usually 74 to 77°F

Forms a warm top layer around Apr 20, lasting about 184 days.

A computer model of this lake's typical weather and water, built from 15 years, 2005 to 2019. Ranges show the middle half of years. The model was not calibrated against measured temperatures for this lake. It is an estimate, not a measurement.

Modeled: U.S. Geological Survey lake temperature data release (doi:10.5066/P9CA6XP8).

Today at the lake

Loading today's forecast…

Forecast: National Weather Service (no endorsement implied). Sunrise, sunset and moon phase are calculated. The moon phase can be a day off.

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Where this comes from

  • Size, depth and lake typeWisconsin DNR lake classifications, checked Oct 23, 2026
  • OutlineWisconsin DNR 24K hydrography, checked Oct 23, 2026
  • Regulations linkWisconsin DNR fishing regulations (linked, not restated), checked Oct 23, 2026
  • Water clarityWisconsin DNR water monitoring, via the Water Quality Portal, checked Oct 23, 2026
  • Typical-year temperatureU.S. Geological Survey lake temperature model (modeled estimate), checked Oct 23, 2026
  • VHS statusWisconsin DNR VHS status by watershed, checked Oct 24, 2026

See data sources for what each source covers, and about for how the numbers are matched to lakes.

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