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Lake Hopatcong Water Level Today

Daily level, distance to full pool and history for Lake Hopatcong, on the Musconetcong River in New Jersey.

Updated · Source: USGS 01455400 Provisional

Water level Provisional

923.49ft

msl · 7:15 PM EST, Nov 8, 2026

  • 0.01 ftbelow full pool (923.5 ft)
  • −0.01 ftin 24 h−0.01 ft in 7 days−0.04 ft in 30 days
922924926922924926922924926
  • Full pool
  • 1 yr ago

Is Lake Hopatcong full?

No. Lake Hopatcong is 0.01 ft below full pool (923.5 ft). It is 1.42 ft higher than a year ago (922.07 ft on Nov 8, 2025).

Lake Hopatcong level history

Full pool 923.5 ft
View data table
DateLevel (ft)% full
Nov 8, 2026923.49—
Nov 7, 2026923.51—
Nov 6, 2026923.51—
Nov 5, 2026923.48—
Nov 4, 2026923.48—
Nov 3, 2026923.48—
Nov 2, 2026923.49—
Nov 1, 2026923.50—
Oct 31, 2026923.52—
Oct 30, 2026923.53—
Oct 29, 2026923.53—
Oct 28, 2026923.54—
Oct 27, 2026923.55—
Oct 26, 2026923.55—
Oct 25, 2026923.56—
Oct 24, 2026923.57—
Oct 23, 2026923.59—
Oct 22, 2026923.60—
Oct 21, 2026923.62—
Oct 20, 2026923.64—
Oct 19, 2026923.65—
Oct 18, 2026923.66—
Oct 17, 2026923.69—
Oct 16, 2026923.68—
Oct 15, 2026923.68—
Oct 14, 2026923.69—
Oct 13, 2026923.70—
Oct 12, 2026923.70—
Oct 11, 2026923.59—
Oct 10, 2026923.52—
Oct 9, 2026923.53—
  • Lake Hopatcong level
  • Full pool 923.5 ft
  • Above full pool
Source: USGS · Daily averages since 2013

Lake Hopatcong on Nov 8 in past years

Lake Hopatcong water level on Nov 8 in past years
YearLevel (ft)vs todayvs full pool
2026today923.49—−0.01 ft
2025922.07−1.42−1.43 ft
2024922.66−0.83−0.84 ft
2023918.59−4.90−4.91 ft
2022922.49−1.00−1.01 ft
2021923.69+0.20+0.19 ft
2020923.47−0.02−0.03 ft
2019923.66+0.17+0.16 ft
2018918.87−4.62−4.63 ft
2017923.73+0.24+0.23 ft
2016921.94−1.55−1.56 ft

Today’s level is the highest for this date since 2021.

Lake facts

Full pool
923.5 ft msl
Highest since 2013
924.35 ftAug 23, 2021
Lowest since 2013
918.25 ftNov 25, 2013
Data since
Oct 1, 2013
Dam
Lake Hopatcong Damcompleted 1925
River
Musconetcong River
Owned by
Division of Parks and Forestry
Dam location
Morris County
Gauge location
40.9175, −74.6642

Dam, river and owner from the National Inventory of Dams (USACE). Records cover Oct 1, 2013 to today (daily averages).

Weather on the lake

  1. Tonight39°FLowW 10 mphMostly Clear
  2. Monday55°FHighLow 36°FW 10–20 mphMostly Sunny
  3. Tuesday60°FHighLow 37°FW 5–10 mphMostly Sunny
  4. Wednesday60°FHighLow 37°FW 0–5 mphSunny
  5. Thursday52°FHighLow 34°FE 0–5 mphLight Rain Likely
  6. Friday41°FHighLow 29°FN 10 mphLight Rain
  7. Saturday42°FHighLow 29°FNW 10 mphChance Rain and Snow

Forecast: National Weather Service for the dam area (40.92, −74.66). Wind speeds are forecasts, not measurements.

Nearby lakes

Quick answers

What is the full pool level of Lake Hopatcong?
923.5 ft above sea level, which is 9.0 ft on the dam gauge: the normal pool and spillway crest set by the New Jersey DEP.
How much does Lake Hopatcong need to be full?
Lake Hopatcong needs 0.01 ft more water to reach full pool (923.5 ft), as of Nov 8, 2026.
Is Lake Hopatcong rising or falling?
It is steady: −0.01 ft in the last 7 days and −0.01 ft in 24 hours, to 923.49 ft on 7:15 PM EST, Nov 8, 2026 (US Geological Survey).
When was Lake Hopatcong last full?
It was last at or above full pool (923.5 ft) on Nov 8, 2026. On Nov 8, 2026 it was 0.01 ft below.
What is the highest level in our data?
Lake Hopatcong reached 924.35 ft on Aug 23, 2021. The lowest was 918.25 ft on Nov 25, 2013 (USGS data since 2013; older records are not in this data set).
How much has Lake Hopatcong changed in the last year?
In the last 12 months it ranged from 921.63 ft (Feb 14, 2026) to 923.97 ft (Aug 3, 2026), a swing of 2.34 ft.
How often is this page updated?
This page is updated several times a day with the latest reading from US Geological Survey. The last reading is from 7:15 PM EST, Nov 8, 2026.

Where this data comes from

Reservoir gauge 01455400 of the US Geological Survey (waterdata.usgs.gov). Recent readings are provisional and may be revised. Weather from the National Weather Service. Dam details from the National Inventory of Dams.

Lake Levels Daily is an independent site, not affiliated with TWDB, LCRA, USACE, USGS, NOAA, TVA or any lake operator. Check official sources before making safety decisions.