The Blue Pool Beat

A tributary of the River Test, the River Dun joins the main river near Kimbridge at Mottisfont in Hampshire's Test Valley. The Blue Pool Beat runs just over a kilometre immediately upstream of Holbury Mill, where the river passes through secluded old woodland on a single-bank configuration suited to one or two rods. The water averages around six metres wide and 1.5 metres deep, and like all chalk streams is commonly described as "gin clear." At the top of the beat sits the namesake Blue Pool — a spring rising directly from the chalk aquifer that gives the water a distinctly blue appearance, and which local folklore claims is bottomless.

The beat carries a very good wild brown trout population, supported by extensive stream habitat above the beat that provides excellent spawning grounds. The Environment Agency and the Wessex Chalk Stream and Rivers Trust have worked together on fish passage improvements on the River Dun in Hampshire, with both mills now equipped with fish ladders allowing free migration throughout the system — raising the prospect of salmon spawning on the Dun again in the future. Fishing is upstream dry fly and upstream nymph only. The trout season runs from April to early October; hawthorn hatches arrive in late April, mayfly from mid-May to early June, and summer brings a variety of caddis, olives, and terrestrials. Reliable patterns include Black Gnat, Gold-Ribbed Hare's Ear, Pheasant Tail Nymph, Iron Blue, and Mayfly in season, tied on size 16 or smaller. The intimate width keeps presentations manageable and fish are generally visible in the clear water, making this a well-suited beat for beginners.

A comfortable fishing hut and picnic furniture are on site — a practical base for a full day's fishing. The beat is a secluded spot and wildlife is abundant, with deer, kingfisher, and orchids regularly seen along the banks. A 9-foot, 4-weight rod is ideal for the width and the delicate presentations the clear water demands. An Environment Agency rod licence is required. The beat is accessed via Holbury Lane near Lockerley, with parking close to the water.