Know what the lake is doing to your dock
Levelwatch reads Tennessee Valley Authority reservoir data and turns it into the thing you actually want to know: whether your dock lines need adjusting before the water moves.
What it does
- Current lake elevation for your reservoir, with TVA’s 12, 24 and 48 hour forecasts on a single gauge.
- A slack calculator that takes your dock measurements and says DANGER, WARNING or OK — and how much line to add or take up.
- Your dock setup saved to your account, so it follows you to a new phone.
What it isn’t
Levelwatch is an informational aid, not a safety system. Forecasts are predictions, and the slack figure is a geometric estimate from the numbers you enter — it knows nothing about line stretch, wind, wake, or the state of your hardware. Go and look at your dock. See the Terms of Use.
Pricing
Lake levels and forecasts are free. The slack calculator is part of Levelwatch Premium, billed through Google Play. Cancel any time in the Play Store under Subscriptions.
Help and account
- Support — common questions, and how to reach us.
- Delete your account and everything stored against it.
- Privacy Policy — what we collect, and what we don’t.
- Terms of Use.
Lake data is published by the Tennessee Valley Authority. Levelwatch is not affiliated with or endorsed by TVA.