Skip to main content
LakeQuality
Late afternoon sun over Slim Lake, scattering a bright path across wind-textured water

Alameda County Lake Quality

California, 11 lakes, measured by SWRCB

Alameda County holds 11 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. The 11 monitored lakes in Alameda County carry whatever clarity, phosphorus, and chlorophyll-a readings SWRCB has published, shown as reported.

Most of the county's monitored lakes are shallow, under 50 feet, which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed.

Loading map…

Where to stay near Alameda County

Top-rated places to stay near Alameda County

Prices for Oct 9–11, 4 adults. Change dates on the map below.

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Planning a trip to Alameda County?

Get lake water-quality updates plus the best cabin & lodging deals near Alameda County — straight to your inbox. No spam, unsubscribe anytime.

Quick Answers for Alameda County

Cleanest lakes in Alameda County →Best swimming lakes in California →

Planning a trip? Check special fishing regulations for Bethany Reservoir — or check the official California fishing regulations.

All Lakes in Alameda County

11 lakes · 0 ranked on readings, 11 without enough sampling0 lakes ranked on readings · 11 without enough sampling, hidden

#LakeClarityPhosphorusAlgaeTrophicAccess
Bethany ReservoirAlamedaNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Don Castro ReservoirAlameda0.3 ftNo recent samplesNo recent samplesNo recent samplesNot recorded
Horseshoe LakeAlameda12.7 ftNo recent samplesNo recent samplesNo recent samples✓ Public
Jordan PondAlameda2.5 ftNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake ChabotAlameda5.3 ftNo recent samplesNo recent samplesNo recent samples✓ Public
Lake Del ValleAlameda7 ftNo recent samplesNo recent samplesNo recent samples✓ Public
Lake ElizabethAlamedaNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Lake MerrittAlameda5.2 ftNo recent samplesNo recent samplesNo recent samples✓ Public
Lake TemescalAlameda6.2 ftNo recent samplesNo recent samplesNo recent samplesNot recorded
San Antonio ReservoirAlamedaNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Upper San Leandro ReservoirAlamedaNo recent samplesNo recent samples17.6 µg/LNo recent samplesNot recorded

NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.

Lake Match

Which lake suits how you actually use one?

Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of lakes that fit, with the water quality behind each one.

Take the quiz →

Other Counties in California

Plumas County

19 lakes

Amador County

12 lakes

Placer County

16 lakes

Butte County

16 lakes

Nevada County

35 lakes

Santa Clara County

13 lakes

Browse every California lake, or the full directory of lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..

Source: the California State Water Resources Control Board. See data sources.