Seasonal Walk: Following a Chalk Stream in Spring

Why a Chalk Stream Feels Different in Spring

A chalk stream is one of the great treasures of the British countryside, and spring is when it shows off. The water rises filtered and cold from deep aquifers, holding a steady ten or eleven degrees Celsius all year, so in April and May it feels noticeably colder than the air above it. That steadiness is what makes it so clear — you can watch a gravel bank four feet down as though you were looking through glass.

England holds the majority of the world's chalk streams, with the Itchen, Test, Kennet, Avon and Frome among the finest. Walking one in spring is not really a walk. It is a slow, quiet act of looking, and the rewards come to those willing to stand still for twenty minutes at a time.

Reading the Bank: Early Wildflowers

Before you start watching the water, watch the ground. Chalk stream banks warm gently and throw up a succession of flowers through April and into June. Cuckooflower, or lady's smock, is the one to look for first — pale lilac, four petals, opening just about when the cuckoo starts calling. It likes damp, unimproved ground, so if you find drifts of it, you are on a good stretch.

• Marsh marigold — big butter-yellow cups in the boggy seepages and ditch edges, flowering from March.
• Lesser celandine — glossy yellow stars on the shaded banks, closing up when rain threatens.
• Water crowfoot — white flowers floating on the stream surface in May, rooted in the gravel below.
• Wild garlic — white star bursts and a smell of onion in the damp woodland at the top of the reach.
• Comfrey — deep purple-pink bells from May, a magnet for early bumblebees.

Take a hand lens. The detail on a cuckooflower anther is worth the trouble, and it slows you down to the right pace for the rest of the walk.

The Residents: Kingfisher and Water Vole

Kingfishers are the headline act, and they are more reliable than people expect. Look for a low branch hanging over open water, or a bare root plate on the outside of a bend, and simply wait. The bird arrives as a streak of electric blue and orange, usually calling with a sharp, high whistle before you see it. A good pair of 8x42 binoculars and a polarising filter over the lens will let you follow it underwater as it dives.

Water voles are harder, but spring is one of the best times. Look for a blunt-nosed, rounded brown animal with small ears, swimming with its head just above the surface, or grazing on the bank. Listen for the loud, watery plop — a water vole entering the water sounds quite different from the softer, drier noise a brown rat makes. If you find burrows the size of a fist in the upper bank, with neat lawns of nibbled grass and stems cut at a clean forty-five degree angle, you are looking at a water vole territory.

Other company may include grey wagtails bobbing on the mill races, a heron standing motionless in the shallows, and by late spring the first banded demoiselles flickering over the water crowfoot.

Practical Ways to See More

• Go early or late. The first two hours after dawn and the last two before dusk are far more productive than the middle of the day.
• Walk upstream. You approach the birds from behind and make less disturbance than walking downstream towards them.
• Wear dull colours. Greens, browns and greys. Bright red waterproofs have their place, but not here.
• Sit low and back. Get behind a tussock of sedge or a fallen willow and stay put for fifteen minutes.
• Never approach a nest hole or burrow. If a bird is carrying food or repeatedly returning to one spot, you have found something worth leaving alone.

Stay on the public footpath, too. Many chalk stream banks are private fishing rights, and wandering onto them causes real friction with the people who care for the water.

Small Kindnesses Along the Way

Spring is a vulnerable season on the river. Trout and grayling are spawning on the gravels, water voles are raising young in the banks, and the first broods of moorhen and mallard are on the water. Keep dogs out of the stream entirely between March and July, and if you must let them swim later in the year, keep them away from the shallow gravel riffles where the redds lie.

Leave the rough edges alone. A stand of nettles, a heap of brash and a rotting log are all habitat. If you spot an American mink, or a clump of Himalayan balsam or Japanese knotweed, report it to your local wildlife trust or rivers group — early records genuinely help. Take litter home, especially discarded fishing line, which tangles birds and voles with grim efficiency.

A Route to Try

Pick a stretch with a footbridge. Park sensibly in the village, follow the water meadow path downstream for a mile or so with the sun behind you, then cross and return on the higher ground. The return leg gives you a different angle on the same water, and often the best views down onto the stream. You will pass through a hedgerow of blackthorn and hawthorn in full flower, which is its own reward in April.

Three miles is ample. Take a flask, a notebook and no particular ambition beyond standing still for a while. That is the whole trick.