Rising and Falling Water – How River Levels Affect the Bite

Anyone who fishes rivers regularly sooner or later realises that the water level often matters more for the bite than the moon phase, air pressure or the colour of your bait. The same stretch behaves like three different waters when it's rising, peaking and falling. Once you understand what the fish do at each stage, you'll know where to look for them even on "bad" water days.

What happens when the river rises?

As the river rises, the flow increases, the current speeds up, the water colours up, and often its temperature changes too – in spring snowmelt brings colder water, and in summer a big downpour can cool the river. The water carries debris, branches and leaves, but also plenty of food: worms, insects and larvae washed in from the banks.

Fish don't like fighting the main current at times like these. They move into calmer water: behind snags and groynes, onto the inside of bends, into side arms, to the mouths of creeks and onto freshly flooded margins. On the Tisza, the spring and early-summer flood waves are well known – the latter is called the "green flood" (zöldár) in Hungarian – when the water spills out onto the floodplain.

The start of a rise: often the best fishing

A gently rising, slightly coloured river often switches fish on. Thanks to the food being washed in, bream and other whitefish, barbel, carp and catfish come closer to the bank, while zander hunt more boldly in the coloured water. This is the time to:

• cast shorter and fish the slower strip along the bank;
• use natural baits such as worms, which the fish are looking for anyway;
• switch to a heavier feeder, or pick livelier, highly visible lure colours.

But when the water rises quickly and a lot, brings heaps of debris and cools sharply, bites usually dry up. Then calm bays, side arms and creek mouths are your only real chance.

The peak and prolonged high water

At the peak and during stable high water, some of the fish move out into the flooded areas, where food is plentiful and the current is weaker. Look for them close to the bank, along the boundary between the old channel and the flooded zone, and at the edges of bushes and trees. Swims get rearranged: where there was a shallow bank at low water, there may now be two metres of water.

Falling water: when fish pull back

As the water drops, fish leave the flooded areas and return to the main channel. Lots of fish can gather at the points where water drains back, at the mouths of side arms and at the outflows of floodplain channels, and predators hunt the small fish being flushed out. That's why the start of a fall is often a very good time. A sudden, rapid drop, however, can make fish cautious; then finer tackle and patience pay off.

Prolonged low water in summer brings a new challenge: fish move into deeper holes, to the foot of stone banks and into the cooler, more oxygenated current lines. At low water, plan your sessions for dawn and dusk. It's also the best chance to map the riverbed: walk the stretch and note where the stones, snags and hollows are that you won't be able to see at higher levels.

Water level	What happens	Where to look	Tip
Start of a rise	water colours up, food is washed in	slow strip along the bank	short casts, worms
Strong rise	fast, cold water full of debris	bays, side arms, creek mouths	heavy rigs, patience
Peak, high water	flooded margins	edge of the flooded zone	fish close to the bank
Falling water	fish pull back	drain-back points, outflows	predators at the outflow
Prolonged low water	fish move into deeper spots	holes, foot of stone banks	dawn, dusk, map the riverbed

How to follow the water level

Gauge readings and forecasts for individual rivers are published regularly by the water authorities. What matters most is not the absolute figure but the trend: has the water risen, fallen or stayed level over the past two or three days? It's worth keeping a fishing diary and noting the reading at the gauge nearest your favourite stretch, together with your results, every time you go. After a season or two you'll have a surprisingly accurate picture of where to fish at which level.

Safety and rules

1. During a flood, don't stand on undercut banks that might collapse, and don't wade into the current.
2. Watch out for debris: a drifting tree trunk can take your rig – or your boat – with it.
3. When flood defence measures are in force, there may be restrictions on dykes and in the floodplain – respect them.
4. If you see fish trapped in isolated pools after the water drops, don't take them; report it to the water manager or the angling club, because fish rescue is carried out by authorised people.
5. Fishing in flooded areas may be specifically restricted by local rules, so check the current regulations.

Summary

Water level is one of the most important factors in river fishing: the start of a rise often brings good bites, in a strong flood your chance lies in calm water, on a falling river the drain-back points are key, and at low water it's the deeper spots. Follow the trend, keep a diary and never take risks with your safety. Before you set off, the site's map search helps you compare which nearby stretch offers calmer water.