Upper Mystic Lake, MA

As of 2026-10-13, Upper Mystic Lake sits at 114.74 ft. Over the past 30 days the level has risen 0.22 ft.

The most recent reading at Upper Mystic Lake is 114.74 ft (2026-10-13), sourced from the U.S. Geological Survey. Readings on this page refresh automatically as the agency publishes new data.

Readings for Upper Mystic Lake run from 113.78 ft to 114.89 ft over the 176 days on file, which begin 2026-04-21. That window is shorter than a year, so neither end is a record for the lake. A lake's range includes a full seasonal cycle, and this gauge has not yet published one.

Reservoir levels move for four main reasons: rainfall and runoff into the basin, releases through the dam for downstream water supply, power generation or flood control, evaporation during hot months, and seasonal drawdown schedules set by the operating agency. Upper Mystic Lake has risen 0.22 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.

Year-over-year comparison is not available for Upper Mystic Lake yet. The published series on this page covers 176 days, from 113.78 ft to 114.89 ft. That is not long enough to describe the lake's historical range.