About This Route
Tenaya Lake sits at 8,149 feet elevation along Tioga Road in Yosemite National Park, a stunning alpine lake surrounded by granite domes like Tenaya Peak and Polly Dome. While breathtaking for hiking and photography, it draws occasional scuba divers curious about high-altitude freshwater diving. Access is straightforward via the paved pullout on Tioga Road (Highway 120), open only from late May to October due to snow. The lake bottom features submerged boulders, fallen trees, and sparse vegetation, but visibility often drops to 5-10 feet from silt and algae. Water temperatures hover around 50-60°F in summer, making it a challenging site far from typical tropical dives. NPS does not designate it for scuba; all activities are at your own risk with no lifeguards. Follow Leave No Trace principles: pack out all trash, avoid damaging fragile aquatic life, and minimize shore disturbance.
Safety Considerations
Diving Tenaya Lake requires advanced skills due to altitude effects on no-decompression limits (NDLs); treat it as an altitude dive above 4,900 feet per PADI and DAN guidelines, using an altitude-capable dive computer. Always dive with a buddy; currents near inflows from Tenaya Creek can surprise. Check weather via NPS app or ranger stations at Tuolumne Meadows (5 miles east); sudden thunderstorms cause whitecaps and hypothermia risk. Pre-dive: acclimate 24 hours to reduce acute mountain sickness (AMS), hydrate excessively, and monitor for DCS symptoms post-dive. Visibility challenges demand lights and navigation skills; rocky entries/exits risk gear snags or injury. REI experts recommend surface intervals at altitude to off-gas nitrogen safely. Obtain Yosemite entrance pass; no dive permits needed, but report incidents to rangers.
Essential Gear
Beyond standard scuba kit, prioritize cold-water protection: 7mm neoprene wetsuit or drysuit (brands like Bare or Waterproof), altitude dive computer (Shearwater Peregrine), redundant air sources, dive flag for surface support, and SMB for ascent signaling. Include wool socks, hood, and gloves against 45°F bottoms.