Bittern Lake is not individually listed in the Region 4 synopsis, so the regional stillwater default applies: trout daily quota 5, no more than 1 rainbow over 50 cm. A freshwater licence is required for anglers 16 and over. Confirm the current synopsis before you fish.

The lake covers 19.46 hectares. A provincial reconnaissance survey on 1982-07-09 found a maximum depth of 12 m and a mean depth of 4 m, with clear water (7.9 m Secchi visibility), the kind of depth and clarity that rewards fishing structure rather than the open middle. Exactly which system it drains into, the Columbia River or the Spillimacheen, has not been confirmed.

Bittern fishes as a put-grow stillwater: the rainbow trout go in as small yearlings and grow on the lake's natural forage before anglers catch them, so the fish in the net any given summer are one or two seasons removed from the truck, not fresh off it. Work a chironomid under an indicator over the shoals, and swing a balanced leech or Woolly Bugger along the drop-offs suggested by the 12 m deep hole. The stocking record below is the closest thing to a fishing report this lake has.

Bittern has been stocked with rainbow trout every single year from 1990 through 2026, 37 recorded releases without a gap, totalling roughly 126,500 fish. The program has settled into a steady annual pattern in recent years: about 4,000 Blackwater-strain yearlings each spring, averaging 9 to 12 grams at release. Early releases in the 1990s used Pennask and Premier-strain rainbow at a smaller 3,000 fish per year. The full year-by-year history is below.

No confirmed public launch, trailhead or parking area has turned up for Bittern Lake; the only located reference places it near the community of Parson in the upper Columbia Valley. Confirm the access road and any seasonal restrictions locally before planning a trip.