Lake · Hood River County · OR
Is Lost Lake safe to swim?
No advisory or algae bloom reported for this water today.
Updated July 20, 2026 · EPA CyAN satellite
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Know before you get in at Lost Lake.
Get an alert the day a bacteria or algae advisory goes up.
What's in the water at Lost Lake right now
As of July 20, 2026, Lost Lake in Hood River County, Oregon is clear to swim. Satellite imagery detected no blue-green algae bloom as of July 19, 2026. Rainfall over the past week totaled 0.0 in, which can wash bacteria and nutrients into the water.
Blue-green algae at Lost Lake
Lost Lake is a lake in Hood River County, Oregon. Satellite imagery detected no blue-green algae bloom as of July 19, 2026.
Blue-green algae (cyanobacteria) blooms are most common from midsummer into early fall, when the water is warm, calm, and rich in nutrients from runoff. They can produce toxins that make people sick and can be rapidly fatal to dogs, so skip water that looks green, scummy, or like spilled paint, and keep children and pets out of it.
Bloom history at Lost Lake
From EPA CyAN's satellite archive
Over 7 summers of satellite monitoring since 2020, Lost Lake has reached blue-green algae advisory levels in 7 of them, most recently in June 2026. This is a lake that blooms most summers. Its highest recorded reading was 2,119,644 cells/mL in August 2022.
Frequently asked: swimming in Lost Lake
- Is it safe to swim in Lost Lake right now?
- Lost Lake is clear to swim today. Satellite imagery detected no blue-green algae bloom as of July 19, 2026. Conditions can change quickly with wind, heat, and rain, so check the posted signs and look at the water before you get in.
- Does Lost Lake have blue-green algae (cyanobacteria)?
- No blue-green algae bloom is detectable at Lost Lake as of July 19, 2026 (below the satellite's roughly 10,000 cells/mL detection limit). Cyanobacteria can still appear within hours in warm, calm, nutrient-rich water, so look before you swim.
- Can dogs swim in Lost Lake?
- No bloom is detected at Lost Lake today, but dogs are much more vulnerable to blue-green algae than people, and blooms can form within hours. Always keep dogs away from water that looks green, scummy, or discolored, and rinse them off after swimming.
- How often does Lost Lake have blue-green algae blooms?
- Over 7 summers of satellite monitoring since 2020, Lost Lake has reached blue-green algae advisory levels in 7 of them, most recently in June 2026. This is a lake that blooms most summers. Its highest recorded reading was 2,119,644 cells/mL in August 2022.
- How many Oregon lakes and beaches are unsafe for swimming today?
- Today, 31 Oregon waters are above a safe-contact threshold and 1 more warrant caution, out of 213 monitored waters SwimZone tracks in the state.
- How is Lost Lake's water quality measured?
- SwimZone builds this read from EPA CyAN satellite imagery for blue-green algae, official beach and fecal-bacteria advisories where a program monitors Lost Lake, and a recent-rainfall overlay, all refreshed daily. It was last updated July 20, 2026.