About This Spot
Derwentwater, near Keswick in the Lake District National Park, offers stunning wild swimming opportunities with views of Catbells and Skiddaw. Popular entry points include Calfclose Bay and the shore near Lodore Falls. This 3-mile-long lake attracts swimmers for its accessibility, but hidden currents and variable water quality demand caution. According to the Environment Agency, recent tests show high bacteria levels after heavy rain, especially in shallower bays. Follow RNLI guidelines: always swim with a buddy and check bathing water quality at swimmingwater.co.uk before heading out.
Safety Considerations
Cold water shock is a primary risk, with temperatures rarely exceeding 15C (59F) even in summer; enter gradually over 3 minutes to acclimatize. Boats from Keswick launches create hazards, so stay 50 meters offshore and wear high-visibility gear. Post-rainfall, E. coli levels spike; if the water smells off or looks murky, do not swim, as per Outdoor Swimming Society advice. Hypothermia sets in quickly; limit swims to 20 minutes for beginners. Never swim alone, and avoid alcohol or drugs, which impair judgment. Local Mountain Rescue teams report frequent callouts here due to weirs near Lodore.
Essential Gear
Pack a Zone3 tow float in neon yellow for visibility, a Speedo bright swim cap, and Orca neoprene wetsuit (3mm for summer). Add Vulkan neoprene socks against rocky entries, a waterproof whistle, and Aquapac phone pouch for emergencies. REI recommends a dry bag for shore clothes.
Emergency Tips
If in trouble, float on your back, wave your tow float vigorously, and blow your whistle. Shout for your buddy to throw a tow line. Call 999 for Coastguard if alone; nearest team is Keswick Mountain Rescue. Prevent cold water shock by controlled breathing: inhale 4 seconds, exhale 6. Warm up post-swim with hot drinks and dry layers.
This guide aligns with Leave No Trace principles: enter from firm shores to minimize erosion, and pack out all litter. For real-world prep, join guided swims by Great Northern Dive Co. in Keswick. Stay safe and enjoy the fells' embrace responsibly.