Connecticut River at Old Lyme Water Level
Live river level, flow, historical records and forecast for Connecticut River at Old Lyme in CT, United States, built from official government gauge data.
- Location CT, United States
- Watershed outlet connecticut river
- Primary gauge 01194796 (USGS)
About Connecticut River at Old Lyme
The Connecticut River at Old Lyme is a gauged river in the Outlet Connecticut River watershed in Connecticut.
The watershed
This station measures the lower Connecticut River near Long Island Sound, with 11224 sq mi (29070 km2) of drainage above the gauge. That upstream area is what feeds this reading, not the watershed name on the page.
With 23 years on record, the pattern is clear enough for day-to-day use. In this part of New England, spring snowmelt and rain freshet usually set the higher-water season, while summer often brings lower flows. The monthly record here follows that broad rhythm, but the station also shows that large floods can arrive outside spring.
What the numbers say
The highest recorded level is 4.76 ft (1.45 m) in October 2012. The lowest recorded level is -1.43 ft (-0.44 m) in February 2025. That range matters for docks, boat access, and any intake that sits close to the waterline.
The typical high month is April, at 1.32 ft (0.4 m), while the typical low month is February, at 0.86 ft (0.26 m). The typical annual swing is 5.5 in (14 cm). For someone using this river, that is the span to think about when setting fixed gear, checking clearances, or planning around seasonal drawdown and refill.
Reading the hero number
The hero number on this page is best read against the median for the same calendar day, not as a raw height on its own. A single water level can look high or low without saying whether it is unusual for this date. The median puts today beside the station’s own history.
This station is operated by the USGS, and the record here covers 23 years. That makes the comparison useful for people watching for change today, not just for where the river sits in a gauge.
How this page is built
Readings come from official government gauges and are rolled into daily records: the daily mean, high and low for every day on record. Each calendar day gets its own baseline from the full history, so the level you see is compared against what this specific date usually looks like rather than an annual average.
How Nibi Metrics works · Water stories
Nibi Metrics - live water levels, flow, and forecasts for lakes and rivers across Canada, the US and the UK
Real-time water levels, forecasts, and alerts for lakes and rivers across Canada, the US and the UK. Built on official government data.
Nibi Metrics tracks more than 13,000 gauged lakes and rivers across Canada, the United States and the United Kingdom, reading directly from official federal monitoring networks: the Water Survey of Canada, the United States Geological Survey, Quebec's provincial hydrometric network, and the Environment Agency for England. Every number on the platform is measured, not modelled - taken from a government gauge on the water itself and compared against that location's own historical record for this exact date.
What you can see for any monitored lake or river
The level right now, in feet or metres, updated as the source agency publishes new readings - for many stations that is every five to fifteen minutes. How today compares to typical: every location carries its own typical-for-this-date band built from its historical record, so a reading is never just a number - it is above, below, or near what this water usually does on this calendar day. Which way it is moving: a measured RISING, FALLING, or STEADY verdict computed from the gauge's own recent readings, with the rate of change - the difference between a flood ending and one beginning. What comes next: level forecasts up to 72 hours ahead, driven by the gauge's recent behaviour, upstream water, and quantitative precipitation forecasts, alongside live radar, lightning, and weather for the surrounding region.
Alerts that watch the water for you
Set a threshold on any location - a level, a distance above typical, or a rate of climb - and Nibi emails or notifies you the moment the gauge crosses it. Cottagers use it for spring freshet, anglers for river conditions, marinas and municipalities for operations. The scanning runs around the clock against the same measured data shown on every page.
Where Nibi comes from
Nibi means water in Anishinaabemowin. The platform began at a family cottage on Lake Muskoka, Ontario, where the spring melt floods the shoreline most years and the only forecast was standing on the dock, looking, and guessing. It grew into an independent, member-funded platform run by Muskoka Research Inc. - no investors, no data resale, and a privacy policy shorter than most cookie banners. The core data is free for everyone, forever; paid plans add automation like multi-location alerts, deep history, and reports.
Coverage
Nibi spans the continent: every Canadian province and territory with active federal gauges - from Vancouver Island rivers to the Muskoka lakes, prairie reservoirs, and Quebec's hydrometric network - and the United States from Maine to the Texas Hill Country, the Ohio Valley, and the Pacific Northwest. Coverage grows where the water news is: when a basin floods, its gauges join the platform with their full historical records attached. Many stations report every five to fifteen minutes; most report at least hourly; every page states exactly when its gauge last spoke.
Free forever, funded by members
The core promise is simple: the water data is free, for everyone, forever. Live levels, maps, radar, and recent history never sit behind a paywall. Paid plans fund the platform by adding automation - multi-location alerts, decades of history, longer forecasts, and PDF reports - so the people who need more carry the cost for everyone who just needs to check the lake before driving up. There are no investors and no advertising deals shaping what the data says.
Water Stories
Field notes and explainers from the Nibi desk - how to read a staff gauge, what a 100-year flood actually means, how snowpack becomes summer water.
For five years, spring 2019 was the mark every Lake Muskoka decision answered to. In April 2026 the lake went two centimeters higher - and the official books have not caught up yet.
Inside the freshet cycle that puts Manitoba shorelines at risk each year - and why 2026 broke the script.
The science of snow water equivalent and why it drives the season ahead.
What the numbers on the measuring stick actually tell you.
Why Central and South Texas rivers go from gravel beds to fifty-year records in an afternoon - including July 2026 on the Nueces.
One percent, every year, forever - unwrapping hydrology's most misunderstood phrase, and how it differs from our own percentiles.
How every number is computed - About the platform
