Keep Tahoe Blue — Lake Conservation & What Boaters Should Know

The Story Behind "Keep Tahoe Blue"

"Keep Tahoe Blue" is the rallying cry of Lake Tahoe environmental conservation. The phrase is the trademark slogan of the League to Save Lake Tahoe, a non-profit conservation organization founded in 1957 in response to early threats to the lake from rapid post-WWII development.

The League's blue bumper sticker has become one of the most recognizable environmental slogans in the western United States. The phrase captures both a literal goal (preserving Lake Tahoe's exceptional water clarity, which produces its distinctive blue color) and a broader mission (preserving the lake's overall ecological and cultural health).

The Clarity Decline

Lake Tahoe's water clarity has measurably declined over the past 60 years. Specifically:

• 1968 baseline: Clarity measured at approximately 102 feet (Secchi disk visibility — a standard measurement)
• 1990s: Clarity dropped to approximately 65-70 feet
• 2000s-2010s: Clarity stabilized in the 60-75 foot range
• Recent years: Clarity continues to fluctuate, with some years showing improvement and others decline

The decline of approximately 30 feet over 60 years reflects the cumulative impact of basin development, increased sediment runoff, and atmospheric pollution. Without conservation efforts, the decline would have been considerably worse.

What Affects Lake Clarity

Fine Sediment

The biggest single threat. Microscopic dirt particles suspended in the water reduce visibility. Sources: construction sites, road runoff, eroding shorelines, and disturbed soils generally.

Algal Growth

Nutrient runoff (especially nitrogen and phosphorus) feeds algal growth. While Lake Tahoe is still oligotrophic (low-nutrient), even small increases reduce clarity. Sources: agriculture, septic systems, fertilizer use, atmospheric deposition.

Invasive Species

Aquatic invasive species (AIS) like quagga mussels, zebra mussels, and Asian clams threaten the lake's ecological balance. Once established, they're nearly impossible to remove.

What Boaters Can Do

Mandatory AIS Inspection

Every boat entering Lake Tahoe must pass an Aquatic Invasive Species inspection. The Tahoe Resource Conservation District operates inspection stations at lake entry points. Rental boats are inspected and certified by their operators; you don't need to handle this directly for rentals.

The "Clean, Drain, Dry" Protocol

If you bring your own boat to Tahoe (rare for visitors using rental fleets), the protocol is:

• Clean all visible plants, animals, mud from boat exterior
• Drain all ballast tanks, livewells, bilge water
• Dry boat thoroughly before entering Tahoe waters

Pack It In, Pack It Out

Bring a trash bag. Pack out everything you bring, including biodegradable items. Cigarette butts, food scraps, and biodegradable trash all affect the lake.

Use Mooring Buoys Instead of Anchoring When Possible

Anchor damage to lake bottom ecosystems is real. Where mooring buoys are provided (some bays), use them.

Don't Wash Boats With Soaps

Boat-washing in the lake or at marinas should use only fresh water or specially approved biodegradable products. Soap runoff feeds algal growth.

Respect 200-Foot No-Wake

The 200-foot no-wake rule near shore protects shorelines from wave erosion that adds sediment to the lake. Following this rule is direct conservation.

Limit Glass and Single-Use Plastic

Both pollute the lake when accidentally lost overboard. Reusable containers preferred.

League to Save Lake Tahoe Programs

Eyes on the Lake

Citizen-science program where volunteers monitor specific lake locations for invasive species, pollution events, and ecosystem changes. Some boaters participate while doing their normal outings.

Tahoe Blue Beach Cleanups

Regular beach cleanup events at boat-accessible beaches. Volunteers welcome.

Stewardship Days

Volunteer events including invasive species removal, restoration work, education.

Policy Advocacy

The League monitors federal, state, and regional policy affecting Lake Tahoe, advocating for protective measures.

Recent Improvements and Setbacks

Improvements

• Tahoe Regional Planning Agency (TRPA) regulations restrict development
• Wetland restoration projects in Upper Truckee River basin
• Improved stormwater capture in basin developments
• Reduced atmospheric pollution from California and Nevada sources

Setbacks

• Climate change effects (warmer winters, less snowpack, more atmospheric deposition)
• Continued urban growth in some basin areas
• Wildfire smoke from California fires affects lake ecology
• Drought cycles affect water quality

Beyond Clarity: Other Conservation Issues

Forest Health

Beetle infestations and drought stress kill basin trees. Forest fires risk increases. Bark beetle die-off is visible across many basin slopes.

Wildlife

Black bear, mule deer, mountain lion, and bird populations all face habitat pressure from human activity.

Native Cutthroat Trout

The lake's original native fish. Largely displaced by introduced species. Conservation programs aim to restore populations.

Keep Tahoe Blue FAQs

Where can I get a "Keep Tahoe Blue" sticker?

Many basin retailers carry them. Or directly from the League to Save Lake Tahoe (keeptahoeblue.org). Wearing or displaying the sticker supports the cause.

How can rental boaters help conservation?

Follow no-wake rules, pack out trash, avoid spilling fuel, don't anchor on sensitive areas, support marinas with good environmental practices.

Is the lake still getting clearer?

Trends are mixed. Annual variation is significant; long-term clarity trends are stable to slightly improving recently, but climate change pressures are increasing.

What's the biggest threat right now?

Aquatic invasive species (quagga mussels) and climate change effects. AIS prevention via inspection is critical.

Related Reading

Lake Tahoe Clarity →
AIS Inspections →
Boating Rules & Safety →
Native History →