Smallmouth Bass
The one deep hole is the smallmouth's ace. On a reservoir that averages under five feet, the roughly 40-foot zone is the only real vertical structure Eugenia offers, and it anchors the bass against a basin of soft-bottomed weed and flooded wood. Off that deep edge they slide onto the drowned logs and stump lines, working the hard cover a warm, weedy lake mostly denies them.
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From the fourth-Saturday-of-June opener through fall, smallmouth hold the flooded timber and the weedline breaks, running down crayfish and yellow perch along the harder edges. 6 feet against a max near 40, the single deep zone concentrates fish that want cooler, harder water, while the stumps and logs give ambush cover lake-wide.
Water level is the wildcard — this is an Ontario Power Generation hydro reservoir on an annual winter drawdown and spring fill, so cover that held fish in summer can sit high and dry by freeze-up. Fish the wood while the water's up in it, and lean on the deep zone when the reservoir pulls down.
Structure
Flooded-timber cover lake-wide from the drowned farmland — the ambush structure smallmouth relate to on a lake short on rock. Smallmouth is the most-logged species on the lake's angler catch record.
The lone deep-water option against a ~4.6 ft mean — cooler, harder-bottomed water that concentrates fish, especially as the reservoir draws down. No specific named deep hole is publicly documented.
Regulations
This is a summary, not the legal regulation — confirm current rules with the official source before fishing.