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Lake Lillinonah Water Level Today

Daily level, distance to full pool and history for Lake Lillinonah, on the Housatonic River in Connecticut.

Updated · Source: NWS gauge LLIC3 Provisional

Water level Provisional

194.10ft

msl · 5:00 AM CST, Nov 9, 2026

  • 4.18 ftbelow full pool (198.3 ft)
  • +0.60 ftin 24 h+3.01 ft in 7 days−2.10 ft in 30 days
194196198200202194196198200202194196198200202
  • Full pool
  • 1 yr ago

Is Lake Lillinonah full?

No. Lake Lillinonah is 4.18 ft below full pool (198.3 ft). It is 1.70 ft lower than a year ago (195.80 ft on Nov 9, 2025).

Lake Lillinonah level history

Full pool 198.3 ft
View data table
DateLevel (ft)
Nov 9, 2026194.10
Nov 8, 2026193.50
Nov 7, 2026192.70
Nov 6, 2026192.20
Nov 5, 2026191.70
Nov 4, 2026191.30
Nov 3, 2026191.30
Nov 2, 2026191.09
Nov 1, 2026191.04
Oct 31, 2026191.03
Oct 30, 2026190.93
Oct 29, 2026191.09
Oct 28, 2026191.10
Oct 27, 2026190.90
Oct 26, 2026193.90
Oct 25, 2026197.20
Oct 24, 2026197.50
Oct 23, 2026196.60
Oct 21, 2026196.82
Oct 20, 2026196.64
Oct 19, 2026196.61
Oct 18, 2026196.97
Oct 17, 2026196.61
Oct 16, 2026196.71
Oct 14, 2026196.90
Oct 13, 2026197.20
Oct 12, 2026197.10
Oct 11, 2026196.30
Oct 10, 2026196.20
  • Lake Lillinonah level
  • Full pool 198.3 ft
  • Above full pool
Source: NOAA NWPS · Daily averages since 2010

Lake Lillinonah on Nov 9 in past years

Lake Lillinonah water level on Nov 9 in past years
YearLevel (ft)vs todayvs full pool
2026today194.10—−4.18 ft
2025195.80+1.70−2.48 ft
2024191.50−2.60−6.78 ft
2023194.90+0.80−3.38 ft
2022192.64−1.46−5.64 ft
2021195.40+1.30−2.88 ft
2020191.01−3.09−7.27 ft
2019190.90−3.20−7.38 ft
2018191.40−2.70−6.88 ft
2017191.90−2.20−6.38 ft
2016191.30−2.80−6.98 ft

Today’s level is the lowest for this date since 2024.

Lake facts

Full pool (conservation pool)
198.3 ft msl
Highest since 2010
199.20 ftJun 18, 2017
Lowest since 2010
186.50 ftNov 6, 2013
Data since
Dec 8, 2010
Dam
Shepaug Damcompleted 1955
River
Housatonic River
Owned by
FirstLight Power Services LLC
Dam location
New Haven County
Gauge location
41.4478, −73.2978

Dam, river and owner from the National Inventory of Dams (USACE). Records cover Dec 8, 2010 to today (daily averages).

Lake Lillinonah map and depth

  • Dam and level gauge
Shoreline © OpenStreetMap contributors · Open the full map
Surface area
about 1,600 acresmeasured on the OpenStreetMap outline
Height of Shepaug Dam
138 ftNational Inventory of Dams

The outline shows the mapped shoreline, not today’s water line: when the lake is low, the water stands back from it.

Weather on the lake

  1. Today58°FHighLow 36°FNW 9–13 mphChance Rain Showers
  2. Tonight36°FLowW 3–8 mphPartly Cloudy
  3. Tuesday61°FHighLow 38°FW 3–9 mphPatchy Frost then Partly Sunny
  4. Wednesday61°FHighLow 35°FW 1–7 mphPatchy Frost then Sunny
  5. Thursday59°FHighLow 38°FNE 1–7 mphMostly Cloudy then Chance Light Rain
  6. Friday49°FHighLow 31°FNE 13–16 mphLight Rain
  7. Saturday48°FHighLow 30°FN 13–16 mphChance Light Rain

Forecast: National Weather Service for the dam area (41.45, −73.30). Wind speeds are forecasts, not measurements.

Nearby lakes

Quick answers

What is the full pool level of Lake Lillinonah?
198.3 ft above mean sea level, the top of its conservation pool. Above it, water is released or flows over the spillway of Shepaug Dam.
How much does Lake Lillinonah need to be full?
Lake Lillinonah needs 4.18 ft more water to reach full pool (198.3 ft), as of Nov 9, 2026.
Is Lake Lillinonah rising or falling?
It is rising: +3.01 ft in the last 7 days and +0.60 ft in 24 hours, to 194.10 ft on 5:00 AM CST, Nov 9, 2026 (NOAA National Water Prediction Service).
When was Lake Lillinonah last full?
It was last at or above full pool (198.3 ft) on Apr 17, 2026. On Nov 9, 2026 it was 4.18 ft below.
What is the highest level in our data?
Lake Lillinonah reached 199.20 ft on Jun 18, 2017. The lowest was 186.50 ft on Nov 6, 2013 (NOAA NWPS data since 2010; older records are not in this data set).
How much has Lake Lillinonah changed in the last year?
In the last 12 months it ranged from 190.90 ft (Oct 27, 2026) to 198.70 ft (Jan 20, 2026), a swing of 7.80 ft.
How often is this page updated?
This page is updated several times a day with the latest reading from NOAA National Water Prediction Service. The last reading is from 5:00 AM CST, Nov 9, 2026.

Where this data comes from

Lake level reported by FirstLight Power Services LLC through the National Weather Service (gauge LLIC3, water.noaa.gov); history from the Iowa Environmental Mesonet archive of the same reports. Recent readings are provisional. 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.