Ice bottom rig under the hole

An ice bottom rig is a sinker on the bottom with a leader and hook set above it. The bait sits motionless in the near-bottom layer, and the bite is shown by the spring bobber on a winter rod.

Why it's the simplest

It has three parts: a sinker, a leader, a hook. There's nothing to ice up and nothing to break — it holds up to frost better than a float rig, where both the float body and the hole itself can freeze.

What the sinker does

It holds the rig in place and sets the point everything else is measured from. In current it also keeps the rig from lifting — which is why a heavier one is used there than the depth alone would call for. The types are in the section on sinkers.

What the leader's length decides

It sets how far the bait rides above the bottom. A short leader keeps it almost on the bottom, a longer one higher and freer, but it tangles more easily going down. It's the same detail that gets adjusted first when there are no bites.

Why a long leader comes at a cost

The gain in height is paid for in twist: a long leader on a stationary rig winds around the main line every time it's pulled up. In winter it's worse: cold line is stiffer and holds the twist, and untangling it has to be done bare-handed.

What the spring bobber shows

A pull. A fish that has taken the bait and moved off sideways drags on the main line, and the spring bobber bends down. But it reads a lift-bite poorly: lifted bait only slackens the leader, and that barely reaches the spring bobber at all — which is exactly why a float is used where fish tend to bite on the rise.

When it's used

In current and in deep water, where the sinker has to lie still and the bait has to hold its place. And where the angler is working another hole actively: a bottom rig needs no hand movement, so it's set nearby and the spring bobber is checked between drops. It isn't left for long — the hole freezes over before the rig gets the chance to show anything.

How it's set

It's lowered to the bottom, the slack is taken up, and the rod is set on the hole so the spring bobber sits level. Slack here does double harm: it eats into an already weak signal, and it lets the line lie on the edge of the hole, where it freezes.

What it doesn't do

It has no action at all. If the fish will only respond to movement, this rig stays silent all day, and there's nothing to adjust — that's not a setting, it's a property of the rig.