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May 2025 at California’s 10 largest reservoirs

Above average heading into dry season

Folsom, Calif.- Warm weather has finally settled in following a good winter and spring, the summer outlook remains positive at California’s major reservoirs. Below is a quick look at where each major reservoir stands to end the years as well as a glance at previous years.

Here’s how California’s 10 largest reservoirs stand as the dry season is upon us.

Fun Facts

  • Taller than the Hoover Dam, the Lake Oroville Dam at 770 feet is the tallest in the United States.
  • An acre foot is approximately 326,000 gallons. The average U.S. household is estimated to use between one half to one acre foot per year.
  • In 2017, the Lake Oroville Dam spillway at risk of failure caused a large scale evacuation

Total Outdoor use accounts for an estimated 30 percent of water use according the U.S. EPA.

California reservoir levels over time

California's Top 10 Reservoirs

May 2025

RESERVOIR% Capacity% Average
Shasta Lake97115
New Melones83134
Don Pedro77104
Lake Oroville95120
Trinity Lake90116
San Luis Res83100
New Bullards Bar94112
Lake McClure76129
Pine Flat Res67126
FOLSOM LAKE92125

Nov 1, 2023

RESERVOIR% Capacity% Average
Shasta Lake69129
New Melones79147
Don Pedro81123
Lake Oroville68134
Trinity Lake5086
San Luis Res65145
New Bullards Bar69115
Lake McClure65152
Pine Flat Res56202
FOLSOM LAKE57131

November 1, 2022

RESERVOIR% Capacity% Average
Shasta Lake3158
New Melones2445
Don Pedro4975
Lake Oroville3161
Trinity Lake2238
San Luis Res2555
New Bullards Bar62 103
Lake McClure1842
Pine Flat Res1656
FOLSOM LAKE3069

Oct 1, 2021

RESERVOIR% Capacity% Average
Shasta Lake2439
New Melones3563
Don Pedro5074
Lake Oroville2236
Trinity Lake2943
San Luis Res1226
New Bullards Bar4167
Lake McClure2045
Pine Flat Res2059
Folsom Lake2341

Top 10 California Reservoirs – July 4, 2021

RESERVOIR% Capacity% Average
Shasta Lake3848
New Melones5079
Don Pedro6177
Lake Oroville3139
Trinity Lake4755
San Luis Res3251
New Bullards Bar5362
Lake McClure3753
Pine Flat Res2841
Folsom Lake2935

data source: California Dept of Water Resources



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