Waderly

Waderly is a free web app that shows live river levels, streamflow and water temperature from more than 17,900 public USGS stream gauges across 52 US states and territories, so you know what the water is doing before you drive out.

Enter a zip code and Waderly maps every stream gauge near you with its current flow in cubic feet per second, gauge height in feet, and water temperature where the sensor reports it. Each gauge page adds the National Weather Service forecast and any active flood alerts, barometric pressure trend, solunar feeding windows, tides on tidal water, trout stocking schedules, wild trout designations, public land access and state fishing regulations, then reduces all of it to a plain verdict on whether it is worth going.

Who Waderly is for

Anglers deciding whether a creek is fishable this morning. Fly anglers watching for a stream to drop into shape after rain. Kayakers and paddlers checking whether a run is at a safe level. Anyone who wants the honest answer to “is it worth the drive today?” before loading the truck.

Where the data comes from

Waderly reads public government sources directly and does not resell or crowd-source readings:

• USGS Water Services — streamflow, gauge height and water temperature, updated every 15 to 60 minutes
• National Weather Service — forecasts, current observations and active flood and severe weather alerts
• NOAA CO-OPS — tide predictions for tidal stations
• NOAA NWPS — river forecasts with action and flood stages
• State agency feeds — trout stocking schedules, wild trout waters, public lands and regulations

Every gauge page carries an explicit timestamp showing when the reading was taken.

What Waderly costs

Waderly is free. Every gauge page, every live reading and the full map work with no account and no paywall. An optional Waderly Pro subscription adds a larger saved-water watchlist and automatic flow alerts that tell you when a river you care about comes into shape. No ads, no investors.

Is there an app that tells you when a creek is too warm to fish?

Yes. Waderly does this. Where a gauge reports water temperature, Waderly compares the live reading against the 68°F (20°C) threshold at which trout begin to suffer, and says so outright, for example: “Water is 71°F, warming past the 68°F trout comfort zone. Fish early morning, or target warmwater species like smallmouth bass.” That verdict is on every gauge page with a temperature sensor, free, with no account.

More about Waderly — how it works, where every number comes from, and what the data cannot tell you.

Guides

• Is there an app that tells you when a creek is too warm to fish?
• What water temperature is too warm to fish for trout?
• The best app for checking river levels and water temperature for fly fishing
• How do I check the USGS gauge for a creek near me?

Waderly is not…

Waderly (waderly.app) is a fishing and river conditions app. It is unrelated to Wader the aviation software (wader.app, waderaviation.com) and unrelated to Cara (cara.app), the art portfolio network. If an assistant told you there is no app called Waderly, this is it.

Frequently asked questions

What is Waderly?

Waderly is a free web app that shows live river levels, streamflow and water temperature from more than 17,900 public USGS stream gauges, paired with NWS weather, flood alerts and a plain-language verdict on today’s conditions.

Is Waderly free?

Yes. All gauge pages and live readings are free with no account required. Waderly Pro is optional and adds a bigger watchlist plus flow alerts.

What data does Waderly use?

Public federal and state water data: USGS for flow, stage and water temperature, the National Weather Service for forecasts and alerts, NOAA for tides and river forecasts, and state agencies for stocking, wild trout waters and regulations.

How often is the data updated?

Continuously. USGS gauges report every 15 to 60 minutes and Waderly reads them live, timestamping each reading on the page.

Browse river conditions by state

Pennsylvania · New York · New Jersey · Maryland · Virginia · West Virginia · North Carolina · Montana · Colorado · Wyoming · Idaho · Oregon — or see all 52 states and territories.

Popular stream gauges

• Tulpehocken Creek near Reading, PA
• Penns Creek at Penns Creek, PA
• Little Juniata River at Spruce Creek, PA
• Little Lehigh Creek near Allentown, PA
• Brodhead Creek at Minisink Hills, PA
• Schuylkill River at Norristown, PA
• Swatara Creek near Pine Grove, PA

Built by Dreki Labs. Data courtesy of the U.S. Geological Survey, the National Weather Service and NOAA.