Grand Rapids Flowage
Marinette County, Wisconsin · WBIC 610700
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
259 acres
Max depth
21 ft
DNR lake type
Complex, Warm, dark water color
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 1982), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity (satellite estimate)
- Summer 20166.7 ft (240 satellite pixels)
- Summer 20177.1 ft (281 satellite pixels)
No one has measured this lake's clarity in the monitoring data. These are estimates from satellite images of two summers only, so they may not match the lake today.
Secchi depth is how far down a white disk stays visible. A bigger number means clearer water. The estimate tops out at 16 feet.
Landsat satellite estimates published by the Wisconsin DNR (summers 2016 and 2017), averaged over the lake's outline. Informational use only.
Water temperature
A typical year Modeled estimate
- Ice goes outabout Apr 2 (Mar 29 to Apr 12)
- Surface reaches 48°Fabout Apr 22 (Apr 15 to Apr 29)
- Surface reaches 64°Fabout May 24 (May 19 to May 27)
- June surface71°F, usually 70 to 74°F
- July surface78°F, usually 77 to 79°F
- August surface76°F, usually 74 to 77°F
Forms a warm top layer around Jun 11, lasting about 72 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
Forecast: National Weather Service (no endorsement implied). Sunrise, sunset and moon phase are calculated. The moon phase can be a day off.
Stocking history
- Black Crappielast stocked 2024 (large fingerling and yearling); stocked in 2 years since 2010
- Yellow Perchlast stocked 2024 (large fingerling and yearling); stocked in 5 years since 2010
- Walleyelast stocked 2022 (large fingerling); 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.
Boat landings
- 1Grand Rapids Flowage AccessBoat ramp · Concrete Panels surface · Other
Directions
Wisconsin DNR public boat access sites. Checked Oct 23, 2026.
More lakes in Marinette County
- Stephenson Lake8.0 miles away
- Poche De Noche8.2 miles away
- Lake Mary8.8 miles away
- Lake Julia9.3 miles away
- McCall Lake12 miles away
- Little McCall Lake12 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
- Boat landingsWisconsin DNR public boat access sites, 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
- Satellite clarity estimateLandsat summer clarity estimates published by the Wisconsin DNR (2016, 2017), 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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