Mouse Lake Fishing near Mattawa, Ontario

• Overview

  Set in Nipissing District, Mouse Lake is an Ontario water. It sits at 343 metres above sea level. This is sizeable water at about 1.34 sq km, and a boat opens up most of it. At about 5.2 km of edge, most people work one arm at a time. Few waters listed in Nipissing District are bigger. For a base, Mattawa sits 33 km out. Powassan follows at 48 km, then Callander at 54 km. Rules here are straightforward: one set of provincial rules.

• Where to Fish on Mouse Lake

  We hold no depth figure for this one. Read the surface for the wind lane, then fish the edge of it. Still water like this holds fish on the edges rather than out in the open. Nipissing District records list smallmouth bass, cisco, yellow perch and pumpkinseed among the fish reported. Those are county-wide records, so not every one of them will be in this water. The shape of Mouse Lake decides where the fish sit.

• Seasonal Patterns

  Long-term averages put July at about 18°C and January near -13°C. Seasons are distinct, and each one fishes differently. Look for the thaw near late April; the fishing lifts straight after. Break-up near late April, freeze-up near late November: that is the shape of an average year. The middle of summer slows a little, with dawn and dusk carrying it. Time your trip to Mouse Lake by conditions rather than dates.

• Tackle & Baits

  Our records carry no access rule either way. This is a natural basin, not a dammed one. Overnight stays are possible about 540 m out, where camping is mapped. Largemouth respond to soft plastics tight to cover; go weedless where the growth is heavy. Local rules can differ across the county line, so check where you stand. Access can change hands, so last year's answer may not hold. For a change of water, Club Lake is 2.7 km distant. Where Mouse Lake is concerned, a local answer beats a written one.