Crystal Lake
Marquette County, Wisconsin · WBIC 157300
The DNR lists this lake's watershed (Mecan River) as suspect or infected with VHS, a fish virus. The listing covers the watershed, not a test of this lake. About VHS
Size
124 acres
Max depth
60 ft
DNR lake type
Simple, Warm, clear water color
Water clarity
15 ft
Clear, measured Oct 2026
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
Numbered dots are boat landings; tap one for directions. The list below has the same numbers. Drawn from the DNR's 24K hydrography (surveyed 1984), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
15 ft Secchi depthClear
Last measured Oct 9, 2026. 126 readings on record, 2016 to 2026.
Typical summer clarity (June to September): 16.8 ft, clear, from 90 readings (2016 to 2026).
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 Crystal Lake - Deep Hole. Checked Oct 23, 2026.
Water temperature
62.4°F surface, measured Oct 9, 2026
Measured near the surface (0.91 m down). A single reading, not a daily value.
A typical year Modeled estimate
- Ice goes outabout Apr 7 (Mar 29 to Apr 13)
- Surface reaches 48°Fabout Apr 29 (Apr 14 to May 4)
- Surface reaches 64°Fabout May 15 (May 9 to May 23)
- June surface73°F, usually 73 to 75°F
- July surface80°F, usually 78 to 81°F
- August surface77°F, usually 75 to 78°F
Forms a warm top layer around Apr 21, lasting about 215 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.
Measured: Wisconsin DNR via the Water Quality Portal (checked Oct 23, 2026). Modeled: U.S. Geological Survey lake temperature data release (doi:10.5066/P9CA6XP8).
Today at the lake
Forecast: National Weather Service (no endorsement implied). Sunrise, sunset and moon phase are calculated. The moon phase can be a day off.
Stocking history
- Fathead Minnowlast stocked 2022 (adult); stocked in 2 years since 2010
- Walleyelast stocked 2022 (large fingerling); stocked in 1 year since 2010
- Black Crappielast stocked 2014 (large fingerling); stocked in 1 year 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.
Boat landings
- 1Crystal Lake AccessCarry-in access · Unimproved surface · County
Directions
Wisconsin DNR public boat access sites. Checked Oct 23, 2026.
More lakes in Marquette County
- Lake Sharon1.3 miles away
- Imm Lake1.6 miles away
- Sandy Lake3.0 miles away
- Tuttle Lake4.4 miles away
- Needham Pond4.5 miles away
- Silver Lake6.1 miles away
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
- Boat landingsWisconsin DNR public boat access sites, checked Oct 23, 2026
- Water clarityWisconsin DNR water monitoring, via the Water Quality Portal, checked Oct 23, 2026
- Measured temperatureWisconsin 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
- Depth map linkWisconsin DNR lake maps list, 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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