Water data · Sebago Lake, Maine
Sebago Lake Water Levels
See where the lake stands today, compare seasons, and explore daily water levels back to November 2000.
Interactive chart
Explore the lake record
Loading daily USGS records…
Water surface elevation · ft (NGVD 1929)
View chart data as a table
Source & methods
How to read the chart
One gauge, two measurements
The latest reading is a single observation. The chart uses USGS daily means from Sebago Lake near North Windham, Maine. All values describe the elevation of the lake surface in feet above the NGVD 1929 vertical datum.
How comparisons line up
Year comparisons align the same calendar dates. For a span that crosses years, the chosen comparison year replaces the start year and the rest of the span shifts with it. Missing observations and unmatched leap days stay blank.
What historical means here
The historical average uses approved daily means from completed calendar years. Record high and low overlays show the highest and lowest approved daily means for the matching calendar dates across the station record. The summary cards show the overall station records. Provisional observations can change after USGS review.
How trends are calculated
Weekly and monthly views average the available daily means. The record overlays show the highest and lowest values within each interval. The 30-day trend uses at least 21 observed days in the trailing window. Period statistics use the original daily means.