Prompton Reservoir water level history

Daily records since 1986 · Level today: 1,125.04 ft

Highest on record

1,133.28 ft

Apr 8, 2022

Lowest on record

2.99 ft

Aug 23, 1988

Today

1,125.04 ft

Oct 21, 2026

Years of data

since 1986

In short

Across 8 complete years, 2020 had the lowest average level (1,125.05 ft) and 2021 the highest (1,125.86 ft).

On average the lake is lowest in June (862.04 ft) and highest in February (946.88 ft).

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

Years ranked by their lowest daily level.

Year	Average	Low	Low date	High	High date
2026 (292 days)	1,124.97	1,123.49	Jul 4	1,128.76	Mar 9
2025	1,125.14	1,123.06	Sep 24	1,131.50	May 7
2024	1,125.39	1,123.42	Nov 10	1,130.23	Aug 10
2023	1,125.51	1,123.59	Jun 11	1,130.71	May 1
2022	1,125.56	1,123.18	Aug 17	1,133.28	Apr 8
2021	1,125.86	1,123.95	Aug 17	1,132.93	Oct 27
2020	1,125.05	1,123.25	Sep 25	1,129.64	Dec 25
2019	1,125.66	1,123.32	Oct 1	1,130.24	May 14
2018 (321 days)	1,126.05	1,123.39	Jul 21	1,130.52	Nov 27
2017	1,125.29	1,123.34	Oct 7	1,132.34	Apr 7
2016 (92 days)	1,124.44	1,123.42	Oct 23	1,127.31	Dec 19
1989 (42 days)	5.15	4.12	Oct 17	8.09	Oct 21
1988 (270 days)	8.97	2.99	Aug 23	1,123.22	Sep 30
1987 (310 days)	5.32	3.40	Aug 26	9.41	Sep 14
1986 (259 days)	5.48	3.59	Sep 18	8.16	Mar 19

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

Month	Average	Lowest	Highest
January	946.28	4.75	1,129.06
February	946.88	4.76	1,129.95
March	915.35	4.00	1,129.81
April	890.74	4.93	1,133.28
May	895.49	4.42	1,131.50
June	862.04	3.51	1,129.68
July	895.08	3.21	1,127.19
August	893.40	2.99	1,130.23
September	872.55	3.25	1,129.84
October	886.50	4.12	1,132.93
November	913.32	5.08	1,130.52
December	943.26	5.31	1,130.09

Daily levels as CSV (4,456 rows; credit the original agencies listed below)