Today's reservoir levels
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Statewide storage trend
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Reservoirs
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What TN Dam Watch shows
Dashboard
Statewide storage total at a glance, across all tracked reservoirs.
Reservoir list
Every reservoir's current level, fill %, inflow and outflow.
History & trends
Interactive charts back to February 2021, zoomable and scrubbable.
Compare
Overlay multiple reservoirs on linked basins side by side.
Where the data comes from
Every figure on this site and in the TN Dam Watch app is collected from the Tamil Nadu Water Resources / Agriculture Department's own public reservoir portal at tnagriculture.in/ARS/home/reservoir — the same page anyone can open in a browser, no special access involved.
This is an independent, unofficial project and is not affiliated with, endorsed by, or operated by the Government of Tamil Nadu.
An automated job on this server re-reads the public page roughly every 3 hours and stores what's published. Data typically lags the source by about a day, matching the department's own publishing schedule — and is not a substitute for official advisories during floods or emergencies.
Get the app
TN Dam Watch is a free Android app with offline-friendly caching, Tamil/English support, and no account required.