Winter swoosh
EXTRA,  FEATURES,  November 2025,  View from the Water

Fast, exhilarating and a little scary: a winter swoosh

Simon Griffiths explores how winter puts the wild into river swimming

At times in winter, more than 300m3/ second of water flows over the weir at Teddington Lock – enough to fill an Olympic-size pool in around 10 seconds.

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I started Outdoor Swimmer in 2011 (initially as H2Open Magazine) as an outlet for my passion for swimming outdoors. I've been a swimmer and outdoor swimmer for as long as I remember. Swimming has made a huge difference to my life and I want to share its joys and benefits with as many people as possible. I am also the author of Swim Wild & Free: A Practical Guide to Swimming Outdoors 365 a Year, I provide one-to-one support to swimmers through Swim Mentoring and I'm the creator of the Renaissance Swimmer project.