Thornbury Lake Fishing in Thunder Bay District, Ontario

• Overview

  Thornbury Lake lies in Thunder Bay District, in Ontario. It lies 279 metres above sea level. It measures some 3.20 sq km, and wind has room to build across it. The perimeter runs near 16 km, so plan the walk before you start. Size puts it in the front rank of our Thunder Bay District list. Greenstone sits 150 km from the bank. For a city, Thunder Bay is 332 km off. The nearest boundary is a fair way off.

• Where to Fish on Thornbury Lake

  Depth went unrecorded, which puts the reading back on you. A soft bed grows weed late into autumn, which keeps fish shallow. Look for the band where the shallows give up and the bottom falls away. Open biodiversity records for Thunder Bay District list cisco, blackfin cisco and rainbow smelt. County records show what lives in the area; the local agency holds the water-by-water list. The near bank of Thornbury Lake is often the one people ignore.

• Seasonal Patterns

  The year swings from about -21°C in January to roughly 16°C in July. Cold dominates the year and the fishing works around it. Break-up comes around early May, and the run that follows is short and strong. Break-up near early May, freeze-up near early November: that is the shape of an average year. The weeks after the thaw and the ones before the freeze are the strongest. Thornbury Lake runs to that rhythm year in and year out.

• Tackle & Baits

  Our records carry no access rule either way. It formed naturally, so levels move with rainfall rather than with a gate. Public mapping records no formal access here, so plan for a walk and soft ground. Keep the gear simple: light line, small hooks, split shot and a couple of proven lures. Check locally before you travel, because a wasted drive is a long one. Night access is frequently treated as a separate matter. Harvey Lake at 6.8 km is the sensible second choice. Nothing here settles the position at Thornbury Lake for certain.