Castle Rock Lake
Adams County, Wisconsin · WBIC 1345700
This lake has fishing rules that differ from the standard ones for its area. Check the official rules before you fish. Official regulations
Size
13,955 acres
Max depth
36 ft
DNR lake type
Complex, Warm, dark water color
Water clarity
2.4 ft
Low, measured Oct 1997
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 1983), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
2.4 ft Secchi depthLowOlder reading
Last measured Oct 15, 1997. 15 readings on record, 1994 to 1997.
Nothing has been measured in the last 5 years, so this may not match the lake today.
Measured at the monitoring station named “Castle Rock Flowage - Deepest Point Above Dam At River Mile 159.7 (1604e13nwse)”.
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 Castle Rock Flowage - Deepest Point Above Dam At River Mile 159.7 (1604e13nwse). Checked Oct 23, 2026.
Water temperature
A typical year Modeled estimate
- Ice goes outabout Apr 8 (Apr 3 to Apr 17)
- Surface reaches 48°Fabout Apr 24 (Apr 17 to May 4)
- Surface reaches 64°Fabout May 25 (May 18 to May 30)
- June surface73°F, usually 73 to 75°F
- July surface81°F, usually 79 to 82°F
- August surface78°F, usually 76 to 80°F
Mixes regularly through the summer instead of forming a warm top layer.
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
- Yellow Perchlast stocked 2025 (adult and large fingerling); stocked in 8 years since 2010
- Muskellungelast stocked 2024 (large fingerling and small fingerling); stocked in 13 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
- 1Snug Harbor Boat RampBoat ramp · Paved surface · Other
Directions - 2Castle Rock Flowage AccessBoat ramp · Concrete Plank surface · County
Directions - 3Castle Rock Flowage AccessBoat ramp · Concrete Plank surface · Township
Directions - 4Castle Rock Dam Boat LaunchBoat ramp · Gravel surface · Other
Directions - 5Wisconsin River Carry-InCarry-in access · Paved surface · Other
Directions - 6Castle Rock Park Boat Ramp (listed under Juneau County)Boat ramp · Concrete surface · County
Directions - 7Buckhorn Launch C (listed under Juneau County)Boat ramp · Paved surface · Accessible features · State(dnr)
Directions - 8Launch D (listed under Juneau County)Boat ramp · Concrete Panels surface · State(dnr)
Directions - 9Boat Launch E Ramp (listed under Juneau County)Boat ramp · Gravel surface · State(dnr)
Directions - 1033rd/22nd picnic (listed under Juneau County)Carry-in access · Unimproved surface · State(dnr)
Directions - 11Boat Launch A Ramp (listed under Juneau County)Boat ramp · Concrete surface · State(dnr)
Directions - 12Canoe Launch B (listed under Juneau County)Carry-in access · Gravel surface · State(dnr)
Directions - 13Mays Point (listed under Juneau County)Boat ramp · Concrete Plank surface · Accessible features · Other
Directions - 14Castle Rock Lake - Osprey Landing (listed under Juneau County)Boat ramp · Concrete Plank surface · Accessible features · Other
Directions
Wisconsin DNR public boat access sites. Checked Oct 23, 2026.
Fishing from shore
- BUCKHORN STATE PARK FISHING PIERDirections · DNR details
Wisconsin DNR shore fishing sites. Checked Oct 24, 2026.
More lakes in Adams County
- Arkdale Lake (Millpond)8.3 miles away
- Friendship Lake (Millpond)10 miles away
- Big Roche A Cri Lake12 miles away
- Easton Lake12 miles away
- Patrick Lake17 miles away
- McGinnis Lake19 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
- 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
- Shore fishing sitesWisconsin DNR shore fishing sites, 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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