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Lake Merwin water level history

Daily records since 2017 · Level today: 229.00 ft

Highest on record
239.43 ft
Apr 20, 2019
Lowest on record
218.52 ft
Jan 25, 2022
Today
229.00 ft
Oct 23, 2026
Years of data
9
since 2017

In short

Across 8 complete years, 2025 had the lowest average level (232.55 ft) and 2020 the highest (235.90 ft).

On average the lake is lowest in December (231.58 ft) and highest in June (236.90 ft).

Lake Merwin level, all years

Loading chart…

Measured Normal range for the date (middle 50% of past years)

Each year's lowest and highest level

21722322923524120172018201920202021202220232024202520262017: lowest 228.04 ft (2017-12-06), highest 238.68 ft (2017-10-14), average 234.47 ft, 93 days measured2018: lowest 227.91 ft (2018-11-13), highest 239.18 ft (2018-10-09), average 234.29 ft, 365 days measured2019: lowest 230.90 ft (2019-01-01), highest 239.43 ft (2019-04-20), average 235.66 ft, 365 days measured2020: lowest 231.00 ft (2020-11-02), highest 239.00 ft (2020-08-03), average 235.90 ft, 366 days measured2021: lowest 228.94 ft (2021-11-15), highest 239.00 ft (2021-06-08), average 235.26 ft, 365 days measured2022: lowest 218.52 ft (2022-01-25), highest 239.00 ft (2022-08-06), average 235.16 ft, 361 days measured2023: lowest 228.60 ft (2023-12-04), highest 238.42 ft (2023-06-10), average 235.18 ft, 363 days measured2024: lowest 222.00 ft (2024-12-03), highest 239.27 ft (2024-08-12), average 234.31 ft, 364 days measured2025: lowest 221.96 ft (2025-09-29), highest 239.00 ft (2025-07-03), average 232.55 ft, 365 days measured2026: lowest 225.98 ft (2026-03-13), highest 238.92 ft (2026-04-27), average 233.54 ft, 294 days measured
2172232292352412017201920212023202520262017: lowest 228.04 ft (2017-12-06), highest 238.68 ft (2017-10-14), average 234.47 ft, 93 days measured2018: lowest 227.91 ft (2018-11-13), highest 239.18 ft (2018-10-09), average 234.29 ft, 365 days measured2019: lowest 230.90 ft (2019-01-01), highest 239.43 ft (2019-04-20), average 235.66 ft, 365 days measured2020: lowest 231.00 ft (2020-11-02), highest 239.00 ft (2020-08-03), average 235.90 ft, 366 days measured2021: lowest 228.94 ft (2021-11-15), highest 239.00 ft (2021-06-08), average 235.26 ft, 365 days measured2022: lowest 218.52 ft (2022-01-25), highest 239.00 ft (2022-08-06), average 235.16 ft, 361 days measured2023: lowest 228.60 ft (2023-12-04), highest 238.42 ft (2023-06-10), average 235.18 ft, 363 days measured2024: lowest 222.00 ft (2024-12-03), highest 239.27 ft (2024-08-12), average 234.31 ft, 364 days measured2025: lowest 221.96 ft (2025-09-29), highest 239.00 ft (2025-07-03), average 232.55 ft, 365 days measured2026: lowest 225.98 ft (2026-03-13), highest 238.92 ft (2026-04-27), average 233.54 ft, 294 days measured
Lowest to highest that yearYear average2026 so far

One bar per year from the lowest to the highest daily level, with the year's average. Years with no bar have no daily record in the agency archive.

Lowest years

Years ranked by their lowest daily level.

  • 2022218.52 ft on Jan 25
  • 2025221.96 ft on Sep 29
  • 2024222.00 ft on Dec 3
  • 2018227.91 ft on Nov 13
  • 2023228.60 ft on Dec 4

Yearly highs and lows

YearAverageLowLow dateHighHigh date
2026 (294 days)233.54225.98Mar 13238.92Apr 27
2025232.55221.96Sep 29239.00Jul 3
2024234.31222.00Dec 3239.27Aug 12
2023235.18228.60Dec 4238.42Jun 10
2022235.16218.52Jan 25239.00Aug 6
2021235.26228.94Nov 15239.00Jun 8
2020235.90231.00Nov 2239.00Aug 3
2019235.66230.90Jan 1239.43Apr 20
2018234.29227.91Nov 13239.18Oct 9
2017 (93 days)234.47228.04Dec 6238.68Oct 14

Levels in feet. Partial years show the number of days with data.

Monthly averages

MonthAverageLowestHighest
January232.67218.52239.15
February233.90226.19238.46
March233.45225.98238.23
April235.35228.71239.43
May236.61231.54238.94
June236.90233.75239.00
July236.36232.51239.00
August236.77231.00239.27
September235.43221.96239.07
October234.42224.33239.18
November232.57226.71238.00
December231.58222.00238.31

Download

Daily levels as CSV (3,301 rows; credit the original agencies listed below)