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USGS 01194796 CONNECTICUT RIVER AT OLD LYME, CT

PROVISIONAL DATA SUBJECT TO REVISION

Click to hidestation-specific text
Station operated in cooperation with the Connecticut Department of Energy & Environmental Protection Long Island Sound License Plate Fund.


 
Boating safety tips
Boating and Paddling in Connecticut
This station managed by the East Hartford CT Field Office.

Available Parameters Available Period
  
2009-05-14  2026-10-17
2009-05-14  2026-09-09
2007-10-01  2026-10-17
2009-05-14  2026-10-17
2009-05-14  2026-09-09
2019-04-17  2026-10-17
2019-04-17  2026-09-09
2019-04-17  2026-10-17
2020-01-09  2026-09-09
2019-04-17  2026-10-17
2023-01-18  2026-09-09
2023-10-18  2026-10-17
2019-05-10  2026-10-17
2019-05-10  2026-10-17
2009-05-14  2026-10-17
2009-05-14  2026-09-09
2019-04-17  2026-09-18







 (7)
 
  -- or --

 

 
Summary of all available data for this site
Instantaneous-data availability statement

Temperature, water, degrees Celsius, Bottom
 
-- Data temporarily unavailable for the time period specified --

Temperature, water, degrees Celsius, Top
Most recent instantaneous value: 16.7 10-17-2026   16:45 EDT
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Gage height, feet
Most recent instantaneous value: 2.67 10-17-2026   16:55 EDT
Graph of Gage height, feet

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Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius, Bottom
 
-- Data temporarily unavailable for the time period specified --

Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius, Top
Most recent instantaneous value: 30700 10-17-2026   16:45 EDT
Graph of Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius

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Dissolved oxygen, water, unfiltered, milligrams per liter, Bottom
 
-- Data temporarily unavailable for the time period specified --

Dissolved oxygen, water, unfiltered, milligrams per liter, Top
Most recent instantaneous value: 7.9 10-17-2026   16:45 EDT
Graph of Dissolved oxygen, water, unfiltered, milligrams per liter

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Dissolved oxygen, water, unfiltered, percent of saturation, Bottom
 
-- Data temporarily unavailable for the time period specified --

Dissolved oxygen, water, unfiltered, percent of saturation, Top
Most recent instantaneous value: 91 10-17-2026   16:15 EDT
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pH, water, unfiltered, field, standard units, Bottom
 
-- Data temporarily unavailable for the time period specified --

pH, water, unfiltered, field, standard units, Top
Most recent instantaneous value: 8.2 10-17-2026   16:45 EDT
Graph of pH, water, unfiltered, field, standard units

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Dissolved organic matter fluorescence (fDOM), water, in situ, concentration estimated from reference material, micrograms per liter as quinine sulfate equivalents (QSE), Top
Most recent instantaneous value: 13.5 10-17-2026   16:45 EDT
Graph of Dissolved organic matter fluorescence (fDOM), water, in situ, concentration estimated from reference material, micrograms per liter as quinine sulfate equivalents (QSE)

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Chlorophyll relative fluorescence (fChl), water, in situ, relative fluorescence units (RFU), Top
Most recent instantaneous value: 0.85 10-17-2026   16:45 EDT
Graph of Chlorophyll relative fluorescence (fChl), water, in situ, relative fluorescence units (RFU)

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Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU), Top
Most recent instantaneous value: 3.2 10-17-2026   16:45 EDT
Graph of Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)

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Salinity, water, unfiltered, practical salinity units at 25 degrees Celsius, Bottom
 
-- Data temporarily unavailable for the time period specified --

Salinity, water, unfiltered, practical salinity units at 25 degrees Celsius, Top
Most recent instantaneous value: 19 10-17-2026   16:45 EDT
Graph of Salinity, water, unfiltered, practical salinity units at 25 degrees Celsius

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Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen
 
-- Data temporarily unavailable for the time period specified --