Cast Gill

Bay Beach Lagoons

Brown County, Wisconsin · WBIC 117800

Official regulationsDNR lake map

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

This lake has fishing rules that differ from the standard ones for its area. Check the official rules before you fish. Official regulations

Size

42 acres

Max depth

15 ft

DNR lake type

Simple, Warm, dark water color

Water clarity

0.5 ft

Low, measured Aug 1998

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 1992), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.

Water clarity

0.5 ft Secchi depthLowOlder reading

Last measured Aug 4, 1998. 1 reading on record, 1998.

Only one reading is on record.

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 BAY BEACH LAGOONS - DEEP SPOT. Checked Oct 23, 2026.

Water temperature

A typical year Modeled estimate

  • Ice goes outabout Mar 29 (Mar 16 to Apr 3)
  • Surface reaches 48°Fabout Apr 10 (Mar 31 to Apr 18)
  • Surface reaches 64°Fabout Apr 19 (Apr 8 to Apr 29)
  • June surface78°F, usually 78 to 80°F
  • July surface84°F, usually 81 to 85°F
  • August surface79°F, usually 77 to 81°F

Forms a warm top layer around Apr 15, lasting about 198 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.

Stocking history

  • Rainbow Troutlast stocked 2022 (adult and yearling); stocked in 4 years since 2010

Stocking shows what was added to the lake, not what is in it now.

Wisconsin DNR annual fish stocking summary. Checked Oct 23, 2026.

More lakes in Brown County

All Brown County lakes

Where this comes from

  • Size, depth and lake typeWisconsin DNR lake classifications, checked Oct 23, 2026
  • OutlineWisconsin DNR 24K hydrography, checked Oct 23, 2026
  • Stocking historyWisconsin DNR annual fish stocking summary, 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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