Lake Berryessa and Monticello water level

What this means

Lake Berryessa and Monticello is above normal at 428.11 ft. That reading is from Oct 11, 2026, so the gauge may be offline or reporting late.

The median for mid-October is 422.13 ft, based on 36 years of readings, so the lake level is 5.98 ft above typical. On the same day last year the reading was 429.29 ft, a difference of −1.18 ft.

It has dropped 0.35 ft over the past week. In the last month it has stayed between 428.11 ft and 429.28 ft.

Many reservoirs reach their low point of the year in fall, before winter rain and snow start the refill.

Compared with 36 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date

422.13 ft5.98 ft above the median for this date

Normal for this date

389.30 ft – 431.13 ft8 years in 10 fall in this range (36 years of records)

Same day last year

429.29 ft−1.18 ft

Lowest and highest in 30 days

428.11 ft – 429.28 ft

Lowest and highest in 12 months

428.11 ft – 439.37 ft