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Fishing Report

Rock Lake Fishing Report

Mercer, WI

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Modeled from live National Weather Service data as of Aug 30, 2026 at 7:47 AM CDT, plus solunar and sun/moon times computed in-house. This is a computed report, not an eyewitness catch report.

46.259133, -89.871805

Est. water temp

73.1°F

v1 estimate from air temperature — not a sensor reading

Max depth

18 ft

Deepest measurement on record

Max depth: Stachelek et al. (2021), LAGOS-US DEPTH v1.0, Environmental Data Initiative (CC BY 4.0)

Notes from anglers

Imported from GNIS. Nearest town: Mercer (Vilas County, WI).

Today’s bite

Largemouth Bass fishing report

Excellent · 91/100

Best window today: 1 PM (Excellent · 100/100)

See the full forecast →

Species on record

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Species detail

How to catch them at Rock Lake

Location

Rock Lake · 46.2591, -89.8718

Map data © OpenFreeMap, OpenMapTiles, OpenStreetMap contributors

Nearby

Other lakes nearby

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FAQ

Common questions

What fish are in Rock Lake?

State surveys have confirmed Largemouth Bass, Muskellunge, Northern Pike, and Walleye in Rock Lake.

When's the best time to fish Rock Lake?

Black Crappie feed most actively at Dawn and Dusk, when activity runs about 16% above the daily average across all four light windows. Check today's bite forecast for Rock Lake to see the best window for current conditions.

Where is Rock Lake?

Rock Lake is near Mercer, WI, at 46.2591, -89.8718.

Plan your trip to Rock Lake

Get the hour-by-hour bite forecast and the best times to fish Rock Lake, scored against live National Weather Service weather for this exact spot — showing what every input contributed and how well the evidence supports it.